[gnome-screensaver] Add parentheses to the floor macro to clean screen dirt

[Ray Strode <halfline src gnome org>]

commit 8d8893656081cf1784e71bab0be93bac5f50aa66
Author: Ray Strode <rstrode redhat com>
Date:   Fri Feb 12 15:03:52 2010 -0500

    Add parentheses to the floor macro to clean screen dirt

 savers/floaters.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/savers/floaters.c b/savers/floaters.c
index 2d26e27..9587357 100644
--- a/savers/floaters.c
+++ b/savers/floaters.c
@@ -42,7 +42,7 @@
 #include "gs-theme-window.h"
 
 #ifndef trunc
-#define trunc(x) ((x > 0.0) ? floor(x) : -floor(-x))
+#define trunc(x) (((x) > 0.0) ? floor((x)) : -floor(-(x)))
 #endif
 
 #ifndef OPTIMAL_FRAME_RATE