tty: serial: omap: remove unneeded singlethread workqueue

it wasn't used by anything, just remove it.
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/omap-serial.c

@@ -180,8 +180,6 @@ static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS];
 /* Forward declaration of functions */
 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1);
 
-static struct workqueue_struct *serial_omap_uart_wq;
-
 static inline unsigned int serial_in(struct uart_omap_port *up, int offset)
 {
 	offset <<= up->port.regshift;
@@ -1701,7 +1699,6 @@ static int serial_omap_probe(struct platform_device *pdev)
 	up->calc_latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
 	pm_qos_add_request(&up->pm_qos_request,
 		PM_QOS_CPU_DMA_LATENCY, up->latency);
-	serial_omap_uart_wq = create_singlethread_workqueue(up->name);
 	INIT_WORK(&up->qos_work, serial_omap_uart_qos_work);
 
 	platform_set_drvdata(pdev, up);