Change in coreboot[master]: drivers/spi: Return error in failure case

[Philipp Deppenwiese (Code Review)]

Philipp Deppenwiese has submitted this change and it was merged. ( https://review.coreboot.org/29531 )

Change subject: drivers/spi: Return error in failure case
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drivers/spi: Return error in failure case

In case the function pointer isn't set return an error.

Change-Id: I9de300f651ac93889dafa7377c876bf5ae2c50cc
Signed-off-by: Patrick Rudolph 
Reviewed-on: https://review.coreboot.org/29531
Tested-by: build bot (Jenkins) 
Reviewed-by: Philipp Deppenwiese 
---
M src/drivers/spi/spi_flash.c
1 file changed, 2 insertions(+), 2 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Philipp Deppenwiese: Looks good to me, approved

diff --git a/src/drivers/spi/spi_flash.c b/src/drivers/spi/spi_flash.c
index cc21ccb..b0b5899 100644
--- a/src/drivers/spi/spi_flash.c
+++ b/src/drivers/spi/spi_flash.c
@@ -448,7 +448,7 @@
    if (!flash->ops->get_write_protection) {
    	printk(BIOS_WARNING, "SPI: Write-protection gathering not "
    	       "implemented for this vendor.\n");
-		return 0;
+		return -1;
    }

return flash->ops->get_write_protection(flash, region);
@@ -473,7 +473,7 @@
    if (!flash->ops->set_write_protection) {
    	printk(BIOS_WARNING, "SPI: Setting write-protection is not "
    	       "implemented for this vendor.\n");
-		return 0;
+		return -1;
    }

ret = flash->ops->set_write_protection(flash, region, non_volatile,