tag: xmp: Move static variable to local function

Variable was being written to and could cause crashes
if multiple elements were parsing xmp at the same time.

Moving it to local scope solves the problem.

gst-libs/gst/tag/gstxmptag.c

@@ -957,15 +957,6 @@ struct _GstXmpNamespaceMap
   const gchar *original_ns;
   gchar *gstreamer_ns;
 };
-static GstXmpNamespaceMap ns_map[] = {
-  {"dc", NULL},
-  {"exif", NULL},
-  {"tiff", NULL},
-  {"xap", NULL},
-  {"photoshop", NULL},
-  {"Iptc4xmpCore", NULL},
-  {NULL, NULL}
-};
 
 /* parsing */
 
@@ -1153,6 +1144,16 @@ gst_tag_list_from_xmp_buffer (const GstBuffer * buffer)
   XmpTag *last_xmp_tag = NULL;
   GSList *pending_tags = NULL;
 
+  GstXmpNamespaceMap ns_map[] = {
+    {"dc", NULL},
+    {"exif", NULL},
+    {"tiff", NULL},
+    {"xap", NULL},
+    {"photoshop", NULL},
+    {"Iptc4xmpCore", NULL},
+    {NULL, NULL}
+  };
+
   xmp_tags_initialize ();
 
   g_return_val_if_fail (GST_IS_BUFFER (buffer), NULL);