V4L/DVB (6326): tuner-core.c: fe_has_signal() can return uninitialized value

Initialize strength to zero.

Thanks to Adrian Bunk, who spotted this with the Coverity checker.
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/tuner-core.c

@@ -113,7 +113,7 @@ static void fe_standby(struct tuner *t)
 static int fe_has_signal(struct tuner *t)
 {
 	struct dvb_tuner_ops *fe_tuner_ops = &t->fe.ops.tuner_ops;
-	u16 strength;
+	u16 strength = 0;
 
 	if (fe_tuner_ops->get_rf_strength)
 		fe_tuner_ops->get_rf_strength(&t->fe, &strength);