Hendiadyoin1 85ba70d86f Kernel: Don't override FramebufferDevice's memory regions on mmap ...

This additionally refactors FramebufferDevice::try_to_initialize to not
leave the FramebufferDevice in an invalid state on errors.
This also unifies the logic between FramebufferDevice::mmap and
FramebufferDevice::try_to_initialize.
This comes with the drawback of removing the UNMAP_AFTER_INIT attribute
from this function, which wasn't honoured by IntelNativeGraphicsAdapter
anyway.

2022-03-08 15:58:51 -08:00

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