[Stylecheck] F0, F1, F4

There are remaining C99 comments.

examples/stm32/l1/stm32l-discovery/usart/usart.c

@@ -76,8 +76,9 @@ int main(void)
 			usart_send_blocking(USART2, '\r');
 			usart_send_blocking(USART2, '\n');
 		}
-		for (i = 0; i < 100000; i++) /* Wait a bit. */
+		for (i = 0; i < 100000; i++) { /* Wait a bit. */
 			__asm__("NOP");
+		}
 	}
 
 	return 0;