Do not call CheckPlaneAgainstParents on tiny splits

tools/mbspc/mbspc/brushbsp.c

@@ -1016,11 +1016,11 @@ side_t *SelectSplitSide (bspbrush_t *brushes, node_t *node)
 				pnum = side->planenum;
 				pnum &= ~1;	// allways use positive facing plane
 
-				CheckPlaneAgainstParents (pnum, node);
-
 				if (!CheckPlaneAgainstVolume (pnum, node))
 					continue;	// would produce a tiny volume
 
+				CheckPlaneAgainstParents (pnum, node);
+
 				front = 0;
 				back = 0;
 				both = 0;