fb: handle allocation failure in alloc_apertures()
If the kzalloc() fails we should return NULL. All the places that call alloc_apertures() check for this already. Signed-off-by: Dan Carpenter <error27@gmail.com> Acked-by: James Simmons <jsimmons@infradead.org> Acked-by: Marcin Slusarz <marcin.slusarz@gmail.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
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