(Minor) on_ground type char -> int

src/main.c

@@ -30,7 +30,7 @@ int main(void)
 	unsigned int jump_hold = 0; //number of consecutive frames jump has been held
 	double vspd = 0; //player vertical speed
 	char hspd = 0; //player horizontal speed
-	char on_ground = 6; //remember if player is on solid
+	int on_ground = 6; //remember if player is on solid
 	int player_x = 0;
 	int player_y = 0;
   int start_x = 0;