ASSERT fixes (typo in variable and bad integer casting)

routerLayer => routeLayer (my typo from a recent commit, compile fix)
MINFINITY compiler warning

Author: dlmiles

grouter/grouteMaze.c

@@ -371,7 +371,7 @@ glMazeTile(inPt, tile, dir)
     TileType type = TiGetType(tile);
     Tile *tp;
 
-    ASSERT((int) ch != MINFINITY, "glMazeTile");
+    ASSERT((pointertype)ch != MINFINITY, "glMazeTile");
 
     /*
      * If this is a "real" channel boundary, pick a crossing point,

lef/defRead.c

@@ -499,7 +499,7 @@ DefAddRoutes(
 				*/
 				routeLayer = stype;
 
-				ASSERT(routerLayer >= 0, "routerLayer<0"); /* positive bounds check */
+				ASSERT(routeLayer >= 0, "routeLayer<0"); /* positive bounds check */
 				lefl = defLayerMap[routeLayer].lefInfo;
 
 				/* Get correct rule for nondefault rules */