dri2: Don't make reference to noClientException

noClientException is now never filled in with a meaningful value, it's
always -1. The sole caller of this function disregards the error value
in any case.

Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Adam Jackson <ajax@redhat.com>

glx/glxdri2.c

@@ -297,7 +297,7 @@ __glXDRIcontextWait(__GLXcontext * baseContext,
     }
 
     if (ret) {
-        *error = cl->client->noClientException;
+        *error = -1;
         return TRUE;
     }