From: c4pp4
Subject: [PATCH 1/1] compizconfig: fix spurious error messages

openBackend() reports dlerror() even after a successful dlopen(). A library
loaded together with the backend may leave an error behind (e.g. libsystemd
looking up removexattrat(), which glibc does not provide), which is then
logged as "compizconfig - Error: dlopen: ..." although the backend has been
loaded. Report the error only when loading the backend fails.

ccsGSettingsIntegratedSettingWriteValue() calls g_variant_get_type() before
checking the value for NULL and logs "NULL encountered while reading
GSettings value" when the integrated GNOME key does not exist. Keys such as
org.gnome.settings-daemon.plugins.media-keys screenshot, window-screenshot,
terminal and org.gnome.desktop.wm.keybindings toggle-shaded were removed
from newer GNOME schemas. Check for NULL first and skip a missing key
silently, as ccsGSettingsIntegratedSettingReadValue() already does.

Signed-off-by: c4pp4
---
--- a/compizconfig/libcompizconfig/src/ccs_backend_loader.c
+++ b/compizconfig/libcompizconfig/src/ccs_backend_loader.c
@@ -86,7 +86,7 @@
 
     free (dlname);
 
-    if (err)
+    if (!dlhand && err)
     {
 	ccsError ("dlopen: %s", err);
     }
--- a/compizconfig/integration/gnome/gsettings/src/ccs_gnome_integration_gsettings_integrated_setting.c
+++ b/compizconfig/integration/gnome/gsettings/src/ccs_gnome_integration_gsettings_integrated_setting.c
@@ -164,16 +164,18 @@
     char			     *gsettingsTranslatedName = ccsGSettingsIntegratedSettingsTranslateOldGNOMEKeyForGSettings (gnomeKeyName);
 
     GVariant           *variant = ccsGSettingsWrapperGetValue (priv->wrapper, gsettingsTranslatedName);
-    const GVariantType *variantType = g_variant_get_type (variant);
+    const GVariantType *variantType;
     GVariant           *newVariant = NULL;
 
+    /* The key may not exist (e.g. removed from a newer GNOME schema), as in ccsGSettingsIntegratedSettingReadValue () */
     if (!variant)
     {
-	ccsError ("NULL encountered while reading GSettings value");
 	free (gsettingsTranslatedName);
 	return;
     }
 
+    variantType = g_variant_get_type (variant);
+
     switch (type)
     {
 	case TypeInt: