led_tm1637: minor, put spaces around operators

lib/led_tm1637.c

@@ -199,7 +199,7 @@ static inline void led_tm1637_tick(void)
 static bool led_tm1637_write(const uint8_t* data, size_t length)
 {
 	bool to_return = true; // return if write succeeded
-	if (data==NULL || length==0) { // verify there it data to be read
+	if (NULL == data || 0 == length) { // verify there it data to be read
 		return false;
 	}