serial: omap: fix missing comma

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>,
Signed-off-by: Philippe Proulx <philippe.proulx@savoirfairelinux.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/omap-serial.c

@@ -1723,7 +1723,7 @@ static int serial_omap_probe(struct platform_device *pdev)
 	if (!up->port.uartclk) {
 		up->port.uartclk = DEFAULT_CLK_SPEED;
 		dev_warn(&pdev->dev,
-			 "No clock speed specified: using default: %d\n"
+			 "No clock speed specified: using default: %d\n",
 			 DEFAULT_CLK_SPEED);
 	}