ALSA: control: potential uninitialized return value

Smatch complains that "ret" might be uninitialized.

Fixes: fbd3eb7f ("ALSA: control: Add verification for kctl accesses")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20200108053706.h3hcnvmnf62wkjac@kili.mountainSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/core/control.c

@@ -896,7 +896,7 @@ static int sanity_check_elem_value(struct snd_card *card,
 				   u32 pattern)
 {
 	size_t offset;
-	int i, ret;
+	int i, ret = 0;
 	u32 *p;
 
 	switch (info->type) {