[PATCH] DRI2: make target_sbc signed

[Jesse Barnes]

We need to track invalid targets as well as 0 targets, so just make it
unsigned so our comparisons work like they should.

Reported-by: Kristian Høgsberg <krh at bitplanet.net>
Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>

diff --git a/hw/xfree86/dri2/dri2.c b/hw/xfree86/dri2/dri2.c
index 301f4fd..90cca9b 100644
--- a/hw/xfree86/dri2/dri2.c
+++ b/hw/xfree86/dri2/dri2.c
@@ -62,7 +62,7 @@ typedef struct _DRI2Drawable {
     ClientPtr		 blockedClient;
     int			 swap_interval;
     CARD64		 swap_count;
-    CARD64		 target_sbc; /* -1 means no SBC wait outstanding */
+    long		 target_sbc; /* -1 means no SBC wait outstanding */
     CARD64		 last_swap_target; /* most recently queued swap target */
     int			 swap_limit; /* for N-buffering */
 } DRI2DrawableRec, *DRI2DrawablePtr;