Fix UB in tileat()

game/main.c

@@ -144,8 +144,8 @@ static inline double dot(dvec_t v, dvec_t u)
 static inline unsigned
 tileat(const map_t map, int layeridx, double x, double y)
 {
-	const unsigned row = (unsigned)floor(x / TILESIZE) + MAPSHIFTX;
-	const unsigned col = (unsigned)floor(y / TILESIZE) + MAPSHIFTY;
+	const unsigned row = (unsigned)(floor(x / TILESIZE) + MAPSHIFTX);
+	const unsigned col = (unsigned)(floor(y / TILESIZE) + MAPSHIFTY);
 	if (row >= MAPWIDTH || col >= MAPHEIGHT)
 		return 0;
 	else