[media] mantis: fix silly crash case
If we set mantis->fe to NULL on an error its not a good idea to then try passing NULL to the unregister paths and oopsing really. Resolves-bug: https://bugzilla.kernel.org/show_bug.cgi?id=16473Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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