EXA: avoid copy operations if no boxes in use

Simple fix for now, I'm sure damage shouldn't be calling us with nbox = 0.

1 files changed, 4 insertions, 0 deletions

diff --git a/exa/exa_accel.c b/exa/exa_accel.c
index 522224be6..ccef74422 100644
--- a/exa/exa_accel.c
+++ b/exa/exa_accel.c
@@ -401,6 +401,10 @@ exaCopyNtoN (DrawablePtr    pSrcDrawable,
     RegionPtr srcregion = NULL, dstregion = NULL;
     xRectangle *rects;
 
+    /* avoid doing copy operations if no boxes */
+    if (nbox == 0)
+	return;
+
     pSrcPixmap = exaGetDrawablePixmap (pSrcDrawable);
     pDstPixmap = exaGetDrawablePixmap (pDstDrawable);