tty: serial: fsl_lpuart: remove the count initialization as it is not needed

No need to initialize the count variable in lpuart_copy_rx_to_tty(),
so let's remove it here.
Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Sherry Sun <sherry.sun@nxp.com>
Link: https://lore.kernel.org/r/20220418021844.29591-1-sherry.sun@nxp.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/fsl_lpuart.c

@@ -1115,7 +1115,7 @@ static void lpuart_copy_rx_to_tty(struct lpuart_port *sport)
 	struct dma_chan *chan = sport->dma_rx_chan;
 	struct circ_buf *ring = &sport->rx_ring;
 	unsigned long flags;
-	int count = 0, copied;
+	int count, copied;
 
 	if (lpuart_is_32(sport)) {
 		unsigned long sr = lpuart32_read(&sport->port, UARTSTAT);