Fix compile error in muscibrainz.

Fix warning in id3tag.

modules/meta_engine/id3tag.c

@@ -33,6 +33,7 @@
 #include <vlc_interface.h>
 #include <vlc_demux.h>
 #include <vlc_playlist.h>
+#include <vlc_charset.h>
 
 #include <sys/types.h>
 

modules/meta_engine/musicbrainz.c

@@ -165,6 +165,7 @@ static int GetData( vlc_object_t *p_obj, input_item_t *p_item,
         i_ret = EMPTY_STR( psz_arturl ) ? VLC_SUCCESS : VLC_EGENERIC ;
         free( psz_arturl );
         return i_ret;
+    }
 }
 
 static int FindMetaMBId( vlc_object_t *p_this )