MT#55283 typo fix for I6aecff636efd420401856bb8110b3d784f989179

Change-Id: I3f73b9d3482f018d8ae9748d59a161b8067cc294
(cherry picked from commit dc395d5752)

lib/rtplib.c

@@ -107,7 +107,7 @@ error:
 
 
 int rtp_padding(struct rtp_header *header, str *payload) {
-	if (!header || payload->s)
+	if (!header || !payload->s)
 		return 0;
 	if (!(header->v_p_x_cc & 0x20))
 		return 0; // no padding