[glx] Sort format with non double buffering in first place.

Sort format with non double buffering in first place, most conformant
with GLX specification to found the best format for a drawable.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/glx/glitz_glx_format.c b/src/glx/glitz_glx_format.c
index c463d33..192758e 100644
--- a/src/glx/glitz_glx_format.c
+++ b/src/glx/glitz_glx_format.c
@@ -71,7 +71,7 @@ _glitz_glx_format_compare (const void *elem1,
 	    score[i] -= 5;
 
 	if (format[i]->d.doublebuffer)
-	    score[i] += 10;
+	    score[i] -= 10;
 
 	if (format[i]->d.samples > 1)
 	    score[i] -= (20 - format[i]->d.samples);