r300g: fixup the handle_compare function

Accidentally negated in 685c3262b9.

src/gallium/winsys/radeon/drm/radeon_drm_bo.c

@@ -314,7 +314,7 @@ static void radeon_bomgr_destroy(struct pb_manager *_mgr)
     FREE(mgr);
 }
 
-#define PTR_TO_UINT(x) ((unsigned)((intptr_t)(x) & 0xffffffff))
+#define PTR_TO_UINT(x) ((unsigned)((intptr_t)(x)))
 
 static unsigned handle_hash(void *key)
 {
@@ -323,7 +323,7 @@ static unsigned handle_hash(void *key)
 
 static int handle_compare(void *key1, void *key2)
 {
-    return PTR_TO_UINT(key1) == PTR_TO_UINT(key2);
+    return PTR_TO_UINT(key1) != PTR_TO_UINT(key2);
 }
 
 struct pb_manager *radeon_bomgr_create(struct radeon_drm_winsys *rws)