[PATCH 01/10] serial: move WARN_ON() in uart_write() to the condition

["Jiri Slaby (SUSE)" <jirislaby@kernel.org>]

uart code currently does the following in uart_write() and
uart_flush_buffer():
  if (cond) {
    WARN_ON(1);
    return;
  }

It can be rewritten to more obvious and more readable:
  if (WARN_ON(cond))
    return;

Do so.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
---
 drivers/tty/serial/serial_core.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 306ea1a560e6..e31c9b6bd8ab 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -593,10 +593,8 @@ static int uart_write(struct tty_struct *tty,
 	 * This means you called this function _after_ the port was
 	 * closed.  No cookie for you.
 	 */
-	if (!state) {
-		WARN_ON(1);
+	if (WARN_ON(!state))
 		return -EL3HLT;
-	}
 
 	port = uart_port_lock(state, flags);
 	circ = &state->xmit;
@@ -659,10 +657,8 @@ static void uart_flush_buffer(struct tty_struct *tty)
 	 * This means you called this function _after_ the port was
 	 * closed.  No cookie for you.
 	 */
-	if (!state) {
-		WARN_ON(1);
+	if (WARN_ON(!state))
 		return;
-	}
 
 	pr_debug("uart_flush_buffer(%d) called\n", tty->index);
 
-- 
2.41.0