Fix -Werror=cast-function-type

Bump glib-2 required version to 2.58:

  G_SOURCE_FUNC

  https://gitlab.gnome.org/GNOME/glib/commit/039fa6897bb4c5cd30caec8ee3add1a4ef612f76

Build & install:i

  export CC=gcci
  export CFLAGS=-Werror=cast-function-type
  ./autogen.sh --prefix=/usr
  make clean
  make
  sudo make install

1 files changed, 4 insertions, 7 deletions

diff --git a/src/core/screen.c b/src/core/screen.c
index 0b79c460..e14f8d52 100644
--- a/src/core/screen.c
+++ b/src/core/screen.c
@@ -648,9 +648,8 @@ meta_screen_free (MetaScreen *screen,
   meta_screen_ungrab_keys (screen);
 
 #ifdef HAVE_STARTUP_NOTIFICATION
-  g_slist_foreach (screen->startup_sequences,
-                   (GFunc) sn_startup_sequence_unref, NULL);
-  g_slist_free (screen->startup_sequences);
+  g_slist_free_full (screen->startup_sequences,
+                     (GDestroyNotify) sn_startup_sequence_unref);
   screen->startup_sequences = NULL;
 
   if (screen->startup_sequence_timeout != 0)
@@ -797,8 +796,7 @@ meta_screen_manage_all_windows (MetaScreen *screen)
     }
   meta_stack_thaw (screen->stack);
 
-  g_list_foreach (windows, (GFunc)g_free, NULL);
-  g_list_free (windows);
+  g_list_free_full (windows, g_free);
 
   meta_display_ungrab (screen->display);
 }
@@ -838,8 +836,7 @@ meta_screen_composite_all_windows (MetaScreen *screen)
 
   meta_stack_thaw (screen->stack);
 
-  g_list_foreach (windows, (GFunc)g_free, NULL);
-  g_list_free (windows);
+  g_list_free_full (windows, g_free);
 #endif
 }