mpegtssection: Free data in error cases

Data is marked as "transfer full", if we have an error we need to
free it.

gst-libs/gst/mpegts/gstmpegtssection.c

@@ -1223,6 +1223,7 @@ short_packet:
     GST_WARNING
         ("PID 0x%04x section extends past provided data (got:%" G_GSIZE_FORMAT
         ", need:%d)", pid, data_size, section_length + 3);
+    g_free (data);
     return NULL;
   }
 }