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>

1 files changed, 5 insertions, 5 deletions

diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index e0bec06a5f60..435478a245d3 100644
--- 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,