mmc: host: omap_hsmmc: checking for NULL instead of IS_ERR()

devm_pinctrl_get() returns error pointers, it never returns NULL.

Fixes: 455e5cd ("mmc: omap_hsmmc: Pin remux workaround to support SDIO interrupt on AM335x")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/omap_hsmmc.c

@@ -1761,8 +1761,8 @@ static int omap_hsmmc_configure_wake_irq(struct omap_hsmmc_host *host)
 	 */
 	if (host->pdata->controller_flags & OMAP_HSMMC_SWAKEUP_MISSING) {
 		struct pinctrl *p = devm_pinctrl_get(host->dev);
-		if (!p) {
-			ret = -ENODEV;
+		if (IS_ERR(p)) {
+			ret = PTR_ERR(p);
 			goto err_free_irq;
 		}
 		if (IS_ERR(pinctrl_lookup_state(p, PINCTRL_STATE_DEFAULT))) {