Revert "dri2: Don't make reference to noClientException"

It's true that the value would always be -1, if it's not zero, but it's
usually zero is the problem. As a result we return failure from
otherwise successful indirect GLX paths, which isn't very nice of us.

This reverts commit 7d33ab0f8c.

Fixes: https://gitlab.freedesktop.org/xorg/xserver/issues/211
(cherry picked from commit e1fa3beb2f)

glx/glxdri2.c

@@ -295,7 +295,7 @@ __glXDRIcontextWait(__GLXcontext * baseContext,
     }
 
     if (ret) {
-        *error = -1;
+        *error = cl->client->noClientException;
         return TRUE;
     }