glx: Initialize have_back.

Signed-off-by: Brian Paul <brianp@vmware.com>

diff --git a/src/glx/dri2_glx.c b/src/glx/dri2_glx.c
index 86b0a27648e158ddcb1798fb8aa96b13c8bfa776..1c344489c0cc6a88ac70a018a76fcd179206973b 100644 (file)
--- a/src/glx/dri2_glx.c
+++ b/src/glx/dri2_glx.c
@@ -188,6 +188,7 @@ dri2CreateDrawable(__GLXscreenConfigs * psc,
    pdraw->base.psc = psc;
    pdraw->bufferCount = 0;
    pdraw->swap_interval = 1;
+   pdraw->have_back = 0;
 
    DRI2CreateDrawable(psc->dpy, xDrawable);