Fix some more char* -> gchar*.

Signed-off-by: Steffen Jaeckel <jaeckel-floss@eyet-services.de>

src/ui/mucwin.c

@@ -931,7 +931,7 @@ mucwin_hide_occupants(ProfMucWin* mucwin)
     }
 }
 
-char*
+gchar*
 mucwin_get_string(ProfMucWin* mucwin)
 {
     assert(mucwin != NULL);