tty: serial: omap_serial: line is unsigned, don't check < 0

Dan Carpenter reported:
|drivers/tty/serial/8250/8250_omap.c:1025 omap8250_probe()
|warn: unsigned 'up.port.line' is never less than zero.
|1025          if (up.port.line < 0) {

Since of_alias_get_id() and pdev->id can get negative I check for the
error via ret variable.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index e0bec06a5f6070c3f5c37d864fef1d79698767b4..435478a245d3dd27b1697eef70c153c7b98068d0 100644 (file)
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -1653,16 +1653,16 @@ static int serial_omap_probe(struct platform_device *pdev)
        up->port.ops = &serial_omap_pops;
 
        if (pdev->dev.of_node)
-               up->port.line = of_alias_get_id(pdev->dev.of_node, "serial");
+               ret = of_alias_get_id(pdev->dev.of_node, "serial");
        else
-               up->port.line = pdev->id;
+               ret = pdev->id;
 
-       if (up->port.line < 0) {
+       if (ret < 0) {
                dev_err(&pdev->dev, "failed to get alias/pdev id, errno %d\n",
-                                                               up->port.line);
-               ret = -ENODEV;
+                       ret);
                goto err_port_line;
        }
+       up->port.line = ret;
 
        if (up->port.line >= OMAP_MAX_HSUART_PORTS) {
                dev_err(&pdev->dev, "uart ID %d >  MAX %d.\n", up->port.line,