(svn r23094) -Codechange: add a default NULL to GetFoundationSlope and use it

1 files changed, 3 insertions, 2 deletions

diff --git a/src/landscape.h b/src/landscape.h
index f3071868f..a62bde13f 100644
--- a/src/landscape.h
+++ b/src/landscape.h
@@ -36,7 +36,7 @@ byte LowestSnowLine();
 void ClearSnowLine();
 
 int GetSlopeZInCorner(Slope tileh, Corner corner);
-Slope GetFoundationSlope(TileIndex tile, uint *z);
+Slope GetFoundationSlope(TileIndex tile, uint *z = NULL);
 
 uint GetPartialPixelZ(int x, int y, Slope corners);
 uint GetSlopePixelZ(int x, int y);
@@ -66,8 +66,9 @@ static inline int GetSlopePixelZInCorner(Slope tileh, Corner corner)
  */
 static inline Slope GetFoundationPixelSlope(TileIndex tile, uint *z)
 {
+	assert(z != NULL);
 	Slope s = GetFoundationSlope(tile, z);
-	if (z != NULL) *z *= TILE_HEIGHT;
+	*z *= TILE_HEIGHT;
 	return s;
 }