Actually return the number of static entries as stated in the function header.

Fixes E: vlc-beta no-return-in-nonvoid-function menus.cpp:140
Signed-off-by: Rémi Duraffort <ivoire@videolan.org>

modules/gui/qt4/menus.cpp

@@ -137,6 +137,7 @@ int DeleteNonStaticEntries( QMenu *menu )
         else
             i_ret++;
     }
+    return i_ret;
 }
 
 /***