V4L/DVB (13396): correct initialization of audio_mode

This initialization of the value of audio_mode is the one used if nothing
matches in the subsequent switch.  The variable audio_mode is subsequently
assigned to constants such as TUNER_AUDIO_MONO and TUNER_AUDIO_STEREO.
TUNER_AUDIO_STEREO has the same value as V4L2_TUNER_MODE_STEREO, so it
would seem better to use that value here.

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/saa717x.c b/drivers/media/video/saa717x.c
index ad6cd37..6818df5 100644
--- a/drivers/media/video/saa717x.c
+++ b/drivers/media/video/saa717x.c
@@ -1312,7 +1312,7 @@
 		"MONO", "STEREO", "LANG1", "LANG2/SAP"
 	};
 
-	audio_mode = V4L2_TUNER_MODE_STEREO;
+	audio_mode = TUNER_AUDIO_STEREO;
 
 	switch (vt->audmode) {
 		case V4L2_TUNER_MODE_MONO: