[PATCH 34-and-three-quarters/36] tty: gdm724x: simplify gdm_tty_write()

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

len and remain can never be negative in gdm_tty_write(). So remove such
a check and move the check of remaining bytes to the loop condition.
This way, the preceding 'if' is now superfluous too. Fix all that and
make the code cleaner.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Cc: linux-staging@lists.linux.dev
---
 drivers/staging/gdm724x/gdm_tty.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/staging/gdm724x/gdm_tty.c b/drivers/staging/gdm724x/gdm_tty.c
index cbaaa8fa7474..67d9bf41e836 100644
--- a/drivers/staging/gdm724x/gdm_tty.c
+++ b/drivers/staging/gdm724x/gdm_tty.c
@@ -158,10 +158,7 @@ static ssize_t gdm_tty_write(struct tty_struct *tty, const u8 *buf, size_t len)
 	if (!gdm_tty_ready(gdm))
 		return -ENODEV;
 
-	if (!len)
-		return 0;
-
-	while (1) {
+	while (remain) {
 		size_t sending_len = min(MUX_TX_MAX_SIZE, remain);
 		gdm->tty_dev->send_func(gdm->tty_dev->priv_dev,
 					(void *)(buf + sent_len),
@@ -171,8 +168,6 @@ static ssize_t gdm_tty_write(struct tty_struct *tty, const u8 *buf, size_t len)
 					gdm);
 		sent_len += sending_len;
 		remain -= sending_len;
-		if (remain <= 0)
-			break;
 	}
 
 	return len;
-- 
2.41.0