Bail in case of out of memory #21
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This code block blindly
malloc()s its main framebuffer and optionally a second back buffer, but never checks if it actually got any memory back. This will cause the subseqeuentmemset()s calls to crash, in case of memory allocation failure.This code change handles it more gracefully and also deallocates the main framebuffer in case the main framebuffer could be allocated but the back buffer couldn't be allocated.
Crash with this was observed on a Adafruit Metro RP2350.