media: v4l2loopback: fix for dereferenced error
Found the code hasn't check whether some var is NULL before
using it in v4l2loopback. Fix those issues.
Change-Id: I559ed8c0978cf478ed713761b7bc7e3b21c09ff4
Signed-off-by:
Lily Li <lali@codeaurora.org>
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