serial: sccnxp: Fix possible crash if no platform data supplied

This patch fix possible kernel crash if no platform data supplied.
We should not use platform data in this case, instead we will use
default values from private driver structure.
Signed-off-by: NAlexander Shiyan <shc_work@mail.ru>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/sccnxp.c

@@ -891,9 +891,9 @@ static int sccnxp_probe(struct platform_device *pdev)
 	} else
 		memcpy(&s->pdata, pdata, sizeof(struct sccnxp_pdata));
 
-	if (pdata->poll_time_us) {
+	if (s->pdata.poll_time_us) {
 		dev_info(&pdev->dev, "Using poll mode, resolution %u usecs\n",
-			 pdata->poll_time_us);
+			 s->pdata.poll_time_us);
 		s->poll = 1;
 	}