lcd_locate is useless, if not initialized

lcd.c

@@ -245,6 +245,10 @@ void lcd_clear(void)
 
 void lcd_locate(uint8_t row, uint8_t col)
 {
+	if (!lcd_initialized) {
+		return;
+	}
+
   if (row)
     col += 0x40;
   lcd_send_byte(0x80 + col, 0);