intel: added null ptr check

This fixes a segfault seen with piglit's fdo20701 test.

diff --git a/src/mesa/drivers/dri/intel/intel_context.c b/src/mesa/drivers/dri/intel/intel_context.c
index 1222a9a..90e66fa 100644 (file)
--- a/src/mesa/drivers/dri/intel/intel_context.c
+++ b/src/mesa/drivers/dri/intel/intel_context.c
@@ -537,7 +537,7 @@ intelFinish(GLcontext * ctx)
 
        irb = intel_renderbuffer(fb->_ColorDrawBuffers[i]);
 
-       if (irb->region)
+       if (irb && irb->region)
          dri_bo_wait_rendering(irb->region->buffer);
    }
    if (fb->_DepthBuffer) {