tty: serial: jsm: remove redundant assignments to variable linestatus

Variable linestatus is being assigned values that are never read, the
assignments are redundant and can be removed.

Cleans up clang scan warnings:
drivers/tty/serial/jsm/jsm_cls.c:369:2: warning: Value stored to
'linestatus' is never read [deadcode.DeadStores]
drivers/tty/serial/jsm/jsm_cls.c:400:4: warning: Value stored to
'linestatus' is never read [deadcode.DeadStores]
Signed-off-by: NColin Ian King <colin.i.king@gmail.com>
Link: https://lore.kernel.org/r/20220307153047.139639-1-colin.i.king@gmail.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/jsm/jsm_cls.c

@@ -350,7 +350,7 @@ static void cls_assert_modem_signals(struct jsm_channel *ch)
 static void cls_copy_data_from_uart_to_queue(struct jsm_channel *ch)
 {
 	int qleft = 0;
-	u8 linestatus = 0;
+	u8 linestatus;
 	u8 error_mask = 0;
 	u16 head;
 	u16 tail;
@@ -365,8 +365,6 @@ static void cls_copy_data_from_uart_to_queue(struct jsm_channel *ch)
 	head = ch->ch_r_head & RQUEUEMASK;
 	tail = ch->ch_r_tail & RQUEUEMASK;
 
-	/* Get our cached LSR */
-	linestatus = ch->ch_cached_lsr;
 	ch->ch_cached_lsr = 0;
 
 	/* Store how much space we have left in the queue */