winsys/svga: Fix an uninitialized return value

Reported-by: Brian Paul <brianp@vmware.com>
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviwed-by: Brian Paul <brianp@vmware.com>
Cc: "11.0 11.1" <mesa-stable@lists.freedesktop.org>
diff --git a/src/gallium/winsys/svga/drm/vmw_surface.c b/src/gallium/winsys/svga/drm/vmw_surface.c
index 6c0ad3b..a438b1a 100644
--- a/src/gallium/winsys/svga/drm/vmw_surface.c
+++ b/src/gallium/winsys/svga/drm/vmw_surface.c
@@ -170,6 +170,8 @@
       *rebind = vsrf->rebind;
       vsrf->rebind = FALSE;
       vmw_svga_winsys_buffer_unmap(&vsrf->screen->base, vsrf->buf);
+   } else {
+      *rebind = FALSE;
    }
    pipe_mutex_unlock(vsrf->mutex);
 }