Drop explicit NULL initializations from device_operations

Unmentioned fields are initialized with 0 (or NULL) implicitly. Beside
that, the struct has grown over the years. There are too many optional
fields to list them all.

Change-Id: Icb9e14c58153d7c14817bcde148e86e977666e4b
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40126
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/drivers/aspeed/ast2050/ast2050.c

@@ -67,7 +67,6 @@ static struct device_operations aspeed_ast2050_ops  = {
 	.set_resources    = aspeed_ast2050_set_resources,
 	.enable_resources = pci_dev_enable_resources,
 	.init             = aspeed_ast2050_init,
-	.scan_bus         = 0,
 };
 
 static const struct pci_driver aspeed_ast2050_driver __pci_driver = {

src/drivers/dec/21143/21143.c

@@ -43,7 +43,6 @@ static struct device_operations dec_21143_ops = {
 	.set_resources    = pci_dev_set_resources,
 	.enable_resources = pci_dev_enable_resources,
 	.init             = dec_21143_enable,
-	.scan_bus         = 0,
 };
 
 static const struct pci_driver dec_21143_driver __pci_driver = {

src/drivers/emulation/qemu/bochs.c

@@ -140,7 +140,6 @@ static struct device_operations qemu_graph_ops = {
 	.set_resources	  = pci_dev_set_resources,
 	.enable_resources = pci_dev_enable_resources,
 	.init		  = bochs_init,
-	.scan_bus	  = 0,
 };
 
 static const struct pci_driver qemu_stdvga_driver __pci_driver = {

src/drivers/emulation/qemu/cirrus.c

@@ -340,7 +340,6 @@ static struct device_operations qemu_cirrus_graph_ops = {
 	.set_resources	  = pci_dev_set_resources,
 	.enable_resources = pci_dev_enable_resources,
 	.init		  = cirrus_init,
-	.scan_bus	  = 0,
 };
 
 static const struct pci_driver qemu_cirrus_driver __pci_driver = {

src/drivers/intel/i210/i210.c

@@ -228,8 +228,6 @@ static struct device_operations i210_ops  = {
 	.set_resources    = set_resources,
 	.enable_resources = pci_dev_enable_resources,
 	.init             = init,
-	.scan_bus         = 0,
-	.ops_pci          = 0,
 };
 
 static const unsigned short i210_device_ids[] = { 0x1537, 0x1538, 0x1533, 0 };

src/drivers/net/atl1e.c

@@ -162,7 +162,6 @@ static struct device_operations atl1e_ops  = {
 	.set_resources    = pci_dev_set_resources,
 	.enable_resources = pci_dev_enable_resources,
 	.init             = atl1e_init,
-	.scan_bus         = 0,
 };
 
 static const struct pci_driver atl1e_driver __pci_driver = {

src/drivers/net/ne2k.c

@@ -317,8 +317,6 @@ static struct device_operations ne2k_ops  = {
 	.read_resources   = read_resources,
 	.set_resources    = pci_dev_set_resources,
 	.enable_resources = pci_dev_enable_resources,
-	.init             = 0,
-	.scan_bus         = 0,
 };
 
 static const struct pci_driver ne2k_driver __pci_driver = {

src/drivers/net/r8168.c

@@ -372,7 +372,6 @@ static struct device_operations r8168_ops  = {
 	.set_resources    = pci_dev_set_resources,
 	.enable_resources = pci_dev_enable_resources,
 	.init             = r8168_init,
-	.scan_bus         = 0,
 #if CONFIG(HAVE_ACPI_TABLES)
 	.acpi_name        = r8168_net_acpi_name,
 	.acpi_fill_ssdt   = r8168_net_fill_ssdt,

src/drivers/ricoh/rce822/rce822.c

@@ -58,7 +58,6 @@ static struct device_operations rce822_ops = {
 	.enable_resources	= pci_dev_enable_resources,
 	.init			= rce822_init,
 	.enable			= rce822_enable,
-	.scan_bus		= 0,
 	.ops_pci		= &lops_pci,
 };
 

src/drivers/siemens/nc_fpga/nc_fpga.c

@@ -158,8 +158,6 @@ static struct device_operations nc_fpga_ops  = {
 	.set_resources    = pci_dev_set_resources,
 	.enable_resources = pci_dev_enable_resources,
 	.init             = nc_fpga_init,
-	.scan_bus         = 0,
-	.ops_pci          = 0,
 };
 
 static const unsigned short nc_fpga_device_ids[] = { 0x4080, 0x4091, 0 };

src/drivers/sil/3114/sil_sata.c

@@ -38,7 +38,6 @@ static struct device_operations si_sata_ops  = {
 	.set_resources    = pci_dev_set_resources,
 	.enable_resources = pci_dev_enable_resources,
 	.init             = si_sata_init,
-	.scan_bus         = 0,
 };
 
 static const struct pci_driver si_sata_driver __pci_driver = {

src/drivers/uart/oxpcie.c

@@ -52,7 +52,6 @@ static struct device_operations oxford_oxpcie_ops = {
 	.set_resources    = oxford_oxpcie_set_resources,
 	.enable_resources = pci_dev_enable_resources,
 	.init             = oxford_oxpcie_enable,
-	.scan_bus         = 0,
 };
 
 static const struct pci_driver oxford_oxpcie_driver __pci_driver = {

src/drivers/xgi/z9s/z9s.c

@@ -50,7 +50,6 @@ static struct device_operations xgi_z9s_ops  = {
 	.set_resources    = xgi_z9s_set_resources,
 	.enable_resources = pci_dev_enable_resources,
 	.init             = xgi_z9s_init,
-	.scan_bus         = 0,
 };
 
 static const struct pci_driver xgi_z9s_driver __pci_driver = {