mxser: remove else from LSR bits checks

UART_LSR_SPECIAL is composed of UART_LSR_BI, UART_LSR_PE, UART_LSR_FE,
UART_LSR_OE. So status cannot be anything else. Remove the unused else
branch.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20210618061516.662-18-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/mxser.c

@@ -2124,8 +2124,7 @@ static u8 mxser_receive_chars_old(struct tty_struct *tty,
 				} else if (status & UART_LSR_OE) {
 					flag = TTY_OVERRUN;
 					port->icount.overrun++;
-				} else
-					flag = TTY_BREAK;
+				}
 			}
 			tty_insert_flip_char(&port->port, ch, flag);
 			(*cnt)++;