Remove a dubious use of FIND_FIRST_BIT

src/spritecache.cpp

@@ -436,7 +436,7 @@ static bool PadSprites(SpriteLoader::Sprite *sprite, unsigned int sprite_avail,
 static bool ResizeSprites(SpriteLoader::Sprite *sprite, unsigned int sprite_avail, SpriteEncoder *encoder)
 {
 	/* Create a fully zoomed image if it does not exist */
-	ZoomLevel first_avail = static_cast<ZoomLevel>(FIND_FIRST_BIT(sprite_avail));
+	ZoomLevel first_avail = static_cast<ZoomLevel>(FindFirstBit(sprite_avail));
 	if (first_avail != ZOOM_LVL_NORMAL) {
 		if (!ResizeSpriteIn(sprite, first_avail, ZOOM_LVL_NORMAL)) return false;
 		SetBit(sprite_avail, ZOOM_LVL_NORMAL);