[Feature][ZXW-41] merged 0601 version

Change-Id: I667af6bb09d65581d455b73f8984c160b2c67ad8
diff --git a/ap/lib/libtinyalsa/audio_mixer_ctrl.c b/ap/lib/libtinyalsa/audio_mixer_ctrl.c
index c4ffb76..3ec6fe3 100755
--- a/ap/lib/libtinyalsa/audio_mixer_ctrl.c
+++ b/ap/lib/libtinyalsa/audio_mixer_ctrl.c
@@ -1718,7 +1718,7 @@
     string = mixer_ctl_get_enum_string(ctl, val);	
 
 	if(string == NULL){
-		fprintf(stderr, "Invalid string=%d\n",string);
+		fprintf(stderr, "err, string is NULL \n");
 		return -2;		
 	}
 	printf("%s: string=%s !\n",__func__,string);