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[media] dmxdev: don't use before checking file->private_data
authorMauro Carvalho Chehab <m.chehab@samsung.com>
Wed, 3 Sep 2014 17:32:26 +0000 (14:32 -0300)
committerMauro Carvalho Chehab <m.chehab@samsung.com>
Wed, 3 Sep 2014 17:38:06 +0000 (14:38 -0300)
As reported by smatch:
drivers/media/dvb-core/dmxdev.c:1091 dvb_demux_poll() warn: variable dereferenced before check 'dmxdevfilter' (see line 1088)

This was introduced by changeset d102cac8097c.

We need to test before using it.

Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

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