MT#55283 Fix coverity scan defect 9903b413c5

Fix coverity scan defect:

*** CID 1599922:  Control flow issues  (DEADCODE)
/daemon/sdp.c: 1822 in sdp_attr_append()
1816
1817     // Duplicate all attributes from the source (parsed SDP attributes list) into
1818     // the destination (string-format attribute list)
1819     static void sdp_attr_append(sdp_attr_q *dst, attributes_q *attrs) {
1820            if (!attrs)
1821                    return;
>>>     CID 1599922:  Control flow issues  (DEADCODE)
>>>     Execution cannot reach the expression "NULL" inside this statement: "ll = (attrs ? (*attrs).head...".
1822            for (__auto_type ll = attrs ? attrs->head : NULL; ll; ll = ll->next) {
1823                    __auto_type attr = ll->data;
1824                    struct sdp_attr *ac = sdp_attr_dup(attr);
1825                    t_queue_push_tail(dst, ac);
1826            }
1827     }

Change-Id: Ia16b99c765888d0427a833fd6e9bb55567dbb070

daemon/sdp.c

@@ -1819,7 +1819,7 @@ void sdp_orig_free(sdp_origin *o) {
 static void sdp_attr_append(sdp_attr_q *dst, attributes_q *attrs) {
 	if (!attrs)
 		return;
-	for (__auto_type ll = attrs ? attrs->head : NULL; ll; ll = ll->next) {
+	for (__auto_type ll = attrs->head; ll; ll = ll->next) {
 		__auto_type attr = ll->data;
 		struct sdp_attr *ac = sdp_attr_dup(attr);
 		t_queue_push_tail(dst, ac);