From 63be2e1a080718731f9333548759f3890d6da6c9 Mon Sep 17 00:00:00 2001
From: John Cupitt <jcupitt@gmail.com>
Date: Sun, 8 Apr 2012 10:13:10 +0100
Subject: [PATCH] fix warning for unused vips7 gvalue arg

this fixes this warning:

$ vips im_copy_set_meta
GLib-GObject-CRITICAL **: g_value_unset: assertion `G_IS_VALUE (value)'
failed
---
 ChangeLog                           | 1 +
 libvips/deprecated/dispatch_types.c | 6 +++++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 9412c4e3..86d32188 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,6 @@
 6/4/12 started 7.28.3
 - vips_divide() failed for int arguments
+- fix warning for unused vips7 gvalue argument
 
 13/3/12 started 7.28.2
 - xres/yres tiffsave args were broken
diff --git a/libvips/deprecated/dispatch_types.c b/libvips/deprecated/dispatch_types.c
index d354dca5..72147afe 100644
--- a/libvips/deprecated/dispatch_types.c
+++ b/libvips/deprecated/dispatch_types.c
@@ -817,7 +817,11 @@ gvalue_free( im_object obj )
 {
 	GValue *value = obj;
 
-	g_value_unset( value );
+	/* If it's just zeros (built but not used) we'll get an error if we
+	 * unset().
+	 */
+	if( G_IS_VALUE( value ) )
+		g_value_unset( value );
 
 	return( 0 );
 }