udpsrc: fix typo in multicast join error message
diff --git a/gst/udp/gstudpsrc.c b/gst/udp/gstudpsrc.c
index 27045f4..1f77251 100644
--- a/gst/udp/gstudpsrc.c
+++ b/gst/udp/gstudpsrc.c
@@ -1567,7 +1567,7 @@
 membership:
   {
     GST_ELEMENT_ERROR (src, RESOURCE, SETTINGS, (NULL),
-        ("could add membership: %s", err->message));
+        ("could not add membership: %s", err->message));
     g_clear_error (&err);
     gst_udpsrc_close (src);
     return FALSE;