Implement --null-audio, --auto-loop, etc. in pjsua

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@507 74dad513-b988-da41-8d7b-12977e46ad98
diff --git a/pjsip/src/pjsua-lib/pjsua_media.c b/pjsip/src/pjsua-lib/pjsua_media.c
index 9fae480..f5c3c9b 100644
--- a/pjsip/src/pjsua-lib/pjsua_media.c
+++ b/pjsip/src/pjsua-lib/pjsua_media.c
@@ -326,7 +326,7 @@
     }
 
     /* Create sound port if none is created yet */
-    if (pjsua_var.snd_port == NULL) {
+    if (pjsua_var.snd_port==NULL && pjsua_var.null_snd==NULL) {
 	status = pjsua_set_snd_dev(pjsua_var.cap_dev, pjsua_var.play_dev);
 	if (status != PJ_SUCCESS) {
 	    /* Error opening sound device, use null device */