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/device/azalia_device.c

@@ -251,6 +251,5 @@ struct device_operations default_azalia_audio_ops = {
 	.set_resources		= pci_dev_set_resources,
 	.enable_resources	= pci_dev_enable_resources,
 	.init			= azalia_audio_init,
-	.scan_bus		= 0,
 	.ops_pci		= &azalia_audio_pci_ops,
 };

src/device/cardbus_device.c

@@ -157,8 +157,6 @@ struct device_operations default_cardbus_ops_bus = {
 	.read_resources   = cardbus_read_resources,
 	.set_resources    = pci_dev_set_resources,
 	.enable_resources = cardbus_enable_resources,
-	.init             = 0,
 	.scan_bus         = pci_scan_bridge,
-	.enable           = 0,
 	.reset_bus        = pci_bus_reset,
 };

src/device/hypertransport.c

@@ -495,9 +495,7 @@ struct device_operations default_ht_ops_bus = {
 	.read_resources   = pci_bus_read_resources,
 	.set_resources    = pci_dev_set_resources,
 	.enable_resources = pci_bus_enable_resources,
-	.init             = 0,
 	.scan_bus         = ht_scan_bridge,
-	.enable           = 0,
 	.reset_bus        = pci_bus_reset,
 	.ops_pci          = &ht_bus_ops_pci,
 };

src/device/pci_device.c

@@ -761,8 +761,6 @@ struct device_operations default_pci_ops_dev = {
 	.acpi_fill_ssdt    = pci_rom_ssdt,
 #endif
 	.init             = pci_dev_init,
-	.scan_bus         = 0,
-	.enable           = 0,
 	.ops_pci          = &pci_dev_ops_pci,
 };
 
@@ -775,9 +773,7 @@ struct device_operations default_pci_ops_bus = {
 	.read_resources   = pci_bus_read_resources,
 	.set_resources    = pci_dev_set_resources,
 	.enable_resources = pci_bus_enable_resources,
-	.init             = 0,
 	.scan_bus         = pci_scan_bridge,
-	.enable           = 0,
 	.reset_bus        = pci_bus_reset,
 	.ops_pci          = &pci_bus_ops_pci,
 };

src/device/pciexp_device.c

@@ -502,9 +502,7 @@ struct device_operations default_pciexp_ops_bus = {
 	.read_resources   = pci_bus_read_resources,
 	.set_resources    = pci_dev_set_resources,
 	.enable_resources = pci_bus_enable_resources,
-	.init             = 0,
 	.scan_bus         = pciexp_scan_bridge,
-	.enable           = 0,
 	.reset_bus        = pci_bus_reset,
 	.ops_pci          = &pciexp_bus_ops_pci,
 };

src/device/pcix_device.c

@@ -123,9 +123,7 @@ struct device_operations default_pcix_ops_bus = {
 	.read_resources   = pci_bus_read_resources,
 	.set_resources    = pci_dev_set_resources,
 	.enable_resources = pci_bus_enable_resources,
-	.init             = 0,
 	.scan_bus         = pcix_scan_bridge,
-	.enable           = 0,
 	.reset_bus        = pci_bus_reset,
 	.ops_pci          = &pcix_bus_ops_pci,
 };