n_tty: make n_tty_receive_char_special return void

After the previous patch, noone cares about the return value of
n_tty_receive_char_special. ldata->lnext is checked instead.

So switch return type of n_tty_receive_char_special to void.
Signed-off-by: NJiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20210505091928.22010-8-jslaby@suse.czSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/n_tty.c

@@ -1260,12 +1260,8 @@ n_tty_receive_signal_char(struct tty_struct *tty, int signal, unsigned char c)
  *	n_tty_receive_buf()/producer path:
  *		caller holds non-exclusive termios_rwsem
  *		publishes canon_head if canonical mode is active
- *
- *	Returns 1 if LNEXT was received, else returns 0
  */
-
-static int
-n_tty_receive_char_special(struct tty_struct *tty, unsigned char c)
+static void n_tty_receive_char_special(struct tty_struct *tty, unsigned char c)
 {
 	struct n_tty_data *ldata = tty->disc_data;
 
@@ -1273,24 +1269,24 @@ n_tty_receive_char_special(struct tty_struct *tty, unsigned char c)
 		if (c == START_CHAR(tty)) {
 			start_tty(tty);
 			process_echoes(tty);
-			return 0;
+			return;
 		}
 		if (c == STOP_CHAR(tty)) {
 			stop_tty(tty);
-			return 0;
+			return;
 		}
 	}
 
 	if (L_ISIG(tty)) {
 		if (c == INTR_CHAR(tty)) {
 			n_tty_receive_signal_char(tty, SIGINT, c);
-			return 0;
+			return;
 		} else if (c == QUIT_CHAR(tty)) {
 			n_tty_receive_signal_char(tty, SIGQUIT, c);
-			return 0;
+			return;
 		} else if (c == SUSP_CHAR(tty)) {
 			n_tty_receive_signal_char(tty, SIGTSTP, c);
-			return 0;
+			return;
 		}
 	}
 
@@ -1301,7 +1297,7 @@ n_tty_receive_char_special(struct tty_struct *tty, unsigned char c)
 
 	if (c == '\r') {
 		if (I_IGNCR(tty))
-			return 0;
+			return;
 		if (I_ICRNL(tty))
 			c = '\n';
 	} else if (c == '\n' && I_INLCR(tty))
@@ -1312,7 +1308,7 @@ n_tty_receive_char_special(struct tty_struct *tty, unsigned char c)
 		    (c == WERASE_CHAR(tty) && L_IEXTEN(tty))) {
 			eraser(c, tty);
 			commit_echoes(tty);
-			return 0;
+			return;
 		}
 		if (c == LNEXT_CHAR(tty) && L_IEXTEN(tty)) {
 			ldata->lnext = 1;
@@ -1324,7 +1320,7 @@ n_tty_receive_char_special(struct tty_struct *tty, unsigned char c)
 					commit_echoes(tty);
 				}
 			}
-			return 1;
+			return;
 		}
 		if (c == REPRINT_CHAR(tty) && L_ECHO(tty) && L_IEXTEN(tty)) {
 			size_t tail = ldata->canon_head;
@@ -1337,7 +1333,7 @@ n_tty_receive_char_special(struct tty_struct *tty, unsigned char c)
 				tail++;
 			}
 			commit_echoes(tty);
-			return 0;
+			return;
 		}
 		if (c == '\n') {
 			if (L_ECHO(tty) || L_ECHONL(tty)) {
@@ -1375,7 +1371,7 @@ n_tty_receive_char_special(struct tty_struct *tty, unsigned char c)
 			smp_store_release(&ldata->canon_head, ldata->read_head);
 			kill_fasync(&tty->fasync, SIGIO, POLL_IN);
 			wake_up_interruptible_poll(&tty->read_wait, EPOLLIN);
-			return 0;
+			return;
 		}
 	}
 
@@ -1397,7 +1393,6 @@ n_tty_receive_char_special(struct tty_struct *tty, unsigned char c)
 		put_tty_queue(c, ldata);
 
 	put_tty_queue(c, ldata);
-	return 0;
 }
 
 static void n_tty_receive_char(struct tty_struct *tty, unsigned char c)