[media] V4L: sh_mobile_ceu_camera: fix Oops when USERPTR mapping fails
If vb2_dma_contig_get_userptr() fails on a videobuffer, driver's .buf_init() method will not be called and the list will not be initialised. Trying to remove an uninitialised element from a list leads to a NULL-dereference. Signed-off-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de> Tested-by: NBastian Hecht <hechtb@gmail.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>
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