serial: Remove unnecessary amba_set_drvdata()

Driver core clears the driver data to NULL after device_release
or on probe failure, so just remove it from here.

Driver core change:
"device-core: Ensure drvdata = NULL when no driver is bound"
(sha1: 0998d0631001288a5974afc0b2a5f568bcdecb4d)

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/amba-pl010.c

@@ -728,7 +728,6 @@ static int pl010_probe(struct amba_device *dev, const struct amba_id *id)
 	amba_set_drvdata(dev, uap);
 	ret = uart_add_one_port(&amba_reg, &uap->port);
 	if (ret) {
-		amba_set_drvdata(dev, NULL);
 		amba_ports[i] = NULL;
 		clk_put(uap->clk);
  unmap:
@@ -745,8 +744,6 @@ static int pl010_remove(struct amba_device *dev)
 	struct uart_amba_port *uap = amba_get_drvdata(dev);
 	int i;
 
-	amba_set_drvdata(dev, NULL);
-
 	uart_remove_one_port(&amba_reg, &uap->port);
 
 	for (i = 0; i < ARRAY_SIZE(amba_ports); i++)

drivers/tty/serial/amba-pl011.c

@@ -2147,7 +2147,6 @@ static int pl011_probe(struct amba_device *dev, const struct amba_id *id)
 	amba_set_drvdata(dev, uap);
 	ret = uart_add_one_port(&amba_reg, &uap->port);
 	if (ret) {
-		amba_set_drvdata(dev, NULL);
 		amba_ports[i] = NULL;
 		pl011_dma_remove(uap);
 	}
@@ -2160,8 +2159,6 @@ static int pl011_remove(struct amba_device *dev)
 	struct uart_amba_port *uap = amba_get_drvdata(dev);
 	int i;
 
-	amba_set_drvdata(dev, NULL);
-
 	uart_remove_one_port(&amba_reg, &uap->port);
 
 	for (i = 0; i < ARRAY_SIZE(amba_ports); i++)