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

[Philipp Deppenwiese (Code Review)]

Philipp Deppenwiese has posted comments on this change. ( https://review.coreboot.org/20368 )

Change subject: libpayload: corebootfb: Add null check for framebuffer address
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Patch Set 2: Code-Review+2