flash_protect: check for NULL flash info
If a flash is unable to be detected, and then someone calls flash_protect
on it (like the common code does in flash_init), the flash_protect logic
will dereference a NULL pointer.
Since flash_protect already does sanity checking on the info structs, add
a NULL pointer check in there.
Signed-off-by: NMike Frysinger <vapier@gentoo.org>
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