clip-boxes: Drop too-early return

The indentation of this line suggests it is a typo.  In any case it
causes the function to unconditionally return immediately, thereby
shortcircuiting it entirely, which does not appear to be the intended
behavior.

Fixes: https://gitlab.com/cairo/cairo/issues/2

src/cairo-clip-boxes.c

@@ -524,7 +524,6 @@ _cairo_clip_reduce_to_boxes (cairo_clip_t *clip)
     cairo_clip_path_t *clip_path;
     cairo_status_t status;
 
-	return clip;
     if (clip->path == NULL)
 	return clip;