Change in coreboot[master]: src: Use NULL instead of 0 for pointer

[build bot (Jenkins) (Code Review)]

build bot (Jenkins) has posted comments on this change. ( https://review.coreboot.org/27096 )

Change subject: src: Use NULL instead of 0 for pointer
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Patch Set 4: Verified-1

Build Unstable

https://qa.coreboot.org/job/coreboot-gerrit/74885/ : UNSTABLE

https://qa.coreboot.org/job/coreboot-checkpatch/28987/ : SUCCESS