add null check for name in mixer_get_ctl_by_name

Bug: 180934608
Test: mm libtinyalsa
Change-Id: Ia245ef3dbe42c897f13b53b52719440e9c89c969

1 files changed, 1 insertions, 1 deletions

diff --git a/mixer.c b/mixer.c
index fd0ad8d..506e0ef 100644
--- a/mixer.c
+++ b/mixer.c
@@ -388,7 +388,7 @@ struct mixer_ctl *mixer_get_ctl_by_name(struct mixer *mixer, const char *name)
     unsigned int n;
     int hw_ctl_count;
 
-    if (!mixer)
+    if (!mixer || !name)
         return NULL;
 
     hw_ctl_count = mixer_grp_get_count(mixer->hw_grp);