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

[build bot (Jenkins) (Code Review)]

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Change subject: src: Use NULL instead of 0 for pointer
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Patch Set 3: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/74252/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/28366/ : SUCCESS