intel/skylake: Fix issues found by klockwork

src/soc/intel/skylake/acpi.c
  Function cbmem_find may return NULL, check before using its result.

src/soc/intel/skylake/flash_controller.c
  Remove dead code: spi_claim_bus is a no-op, always returning 0.

src/soc/intel/skylake/gpio.c
  Check for NULL before using pointers.

src/soc/intel/skylake/igd.c
  Don't copy 0-termination of signature string.

src/soc/intel/skylake/lpc.c
  Don't check unsigned >= 0.

src/soc/intel/skylake/systemagent.c
  Explicitly cast result to 64bit.

BRANCH=None
BUG=chrome-os-partner:48542
TEST=Built & booted Kunimitsu board.

Change-Id: I6cbf4f78382383d3c8c3b15f66c5898ab5bf183a
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: d98a8cdd3d095a6943c0e104cd4938639a62bd14
Original-Change-Id: Id2a31402618f4c9f6f53525ebcf6b71fd67428db
Original-Signed-off-by: Naresh G Solanki <Naresh.Solanki@intel.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/317522
Original-Commit-Ready: Naresh Solanki <naresh.solanki@intel.com>
Original-Tested-by: Naresh Solanki <naresh.solanki@intel.com>
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/12991
Reviewed-by: Martin Roth <martinroth@google.com>
Tested-by: build bot (Jenkins)

src/soc/intel/skylake/igd.c

@@ -118,7 +118,7 @@ static int init_igd_opregion(igd_opregion_t *opregion)
 		die("vbt data not found");
 
 	memcpy(&opregion->header.signature, IGD_OPREGION_SIGNATURE,
-		sizeof(IGD_OPREGION_SIGNATURE));
+		sizeof(IGD_OPREGION_SIGNATURE) - 1);
 	memcpy(opregion->header.vbios_version, vbt->coreblock_biosbuild, sizeof(u32));
 	memcpy(opregion->vbt.gvd1, vbt, vbt->hdr_vbt_size <
 		sizeof(opregion->vbt.gvd1) ? vbt->hdr_vbt_size :