[XS] Change in coreboot[main]: drivers/vpd: Return NULL for missing "feature_device_info"

[Subrata Banik (Code Review)]

Subrata Banik has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/80805?usp=email )

Change subject: drivers/vpd: Return NULL for missing "feature_device_info"
......................................................................

drivers/vpd: Return NULL for missing "feature_device_info"

Previously, vpd_get_feature_device_info() might have returned empty
string if the "feature_device_info" VPD entry was not found. This
change ensures a NULL return in such cases.

BUG=b:324107408
TEST=Verify NULL is returned when calling vpd_get_feature_device_info()
on a platform with a wiped VPD.

Change-Id: I76fc220ed792abdfefb0b1a37873b5b828bfdda8
Signed-off-by: Subrata Banik 
---
M src/drivers/vpd/vpd_device_feature.c
1 file changed, 1 insertion(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/05/80805/1

diff --git a/src/drivers/vpd/vpd_device_feature.c b/src/drivers/vpd/vpd_device_feature.c
index 1c8682a..5413c01 100644
--- a/src/drivers/vpd/vpd_device_feature.c
+++ b/src/drivers/vpd/vpd_device_feature.c
@@ -11,5 +11,5 @@
    if (vpd_gets(VPD_KEY_FEATURE_DEVICE_INFO, device_info, VPD_FEATURE_DEVICE_INFO_LEN,
    		 VPD_RW))
    	return device_info;
-	return "";
+	return NULL;
 }