media: staging: atomisp: Check return value from compat_alloc_user_space
If something gets wrong, return, instead of trying to convert from a NULL pointer. Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
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