[PATCH] alsa-lib: fixed coverity reported issues under "REVERSE_INULL" checker.

[sudarshan.bisht@nokia.com]

From: Sudarshan <sudarshan.bisht@nokia.com>

---
 src/control/setup.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/src/control/setup.c b/src/control/setup.c
index eecda45..3606e5c 100644
--- a/src/control/setup.c
+++ b/src/control/setup.c
@@ -398,7 +398,7 @@ static int snd_config_get_ctl_elem_value(snd_config_t *conf,
 
 static int add_elem(snd_sctl_t *h, snd_config_t *_conf, snd_config_t *private_data)
 {
-	snd_config_t *conf;
+	snd_config_t *conf = NULL ;
 	snd_config_iterator_t i, next;
 	char *tmp;
 	int iface = SND_CTL_ELEM_IFACE_MIXER;
@@ -412,6 +412,9 @@ static int add_elem(snd_sctl_t *h, snd_config_t *_conf, snd_config_t *private_da
 	snd_config_t *value = NULL, *mask = NULL;
 	snd_sctl_elem_t *elem = NULL;
 	int err;
+	/* The last parameter of snd_config_expand() is an output parameter, and
+ 	 * it is guaranteed that this parameter is set when the function succeeds.
+	 */		
 	err = snd_config_expand(_conf, _conf, NULL, private_data, &conf);
 	if (err < 0)
 		return err;
-- 
1.7.0.4