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[media] vb2: Fix error handling in '__vb2_buf_mem_alloc'
'call_ptr_memop' can return NULL, so we must test its return value with 'IS_ERR_OR_NULL'. Otherwise, the test 'if (mem_priv)' is meaningless. Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> Signed-off-by: Hans Verkuil <hansverk@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
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