Change in coreboot[master]: libpayload: corebootfb: Add null check for framebuffer address

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Change subject: libpayload: corebootfb: Add null check for framebuffer address
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Patch Set 1: Verified-1

Build Failed

https://qa.coreboot.org/job/coreboot-gerrit/56194/ : ABORTED

https://qa.coreboot.org/job/coreboot-checkpatch/11796/ : ABORTED