V4L/DVB (7156): em28xx/em28xx-core.c: fix use of potentially uninitialized variable

drivers/media/video/em28xx/em28xx-core.c: In function 'em28xx_set_audio_source':
drivers/media/video/em28xx/em28xx-core.c:276: warning: 'no_ac97' may be used uninitialized in this function

This looks like a genuine bug to me.
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/em28xx/em28xx-core.c

@@ -273,7 +273,8 @@ int em28xx_set_audio_source(struct em28xx *dev)
 	static char *enable  = "\x08\x08";
 	static char *disable = "\x08\x88";
 	char *video = enable, *line = disable;
-	int ret, no_ac97;
+	int ret;
+	int no_ac97 = 0;
 	u8 input;
 
 	if (dev->is_em2800) {