usb: phy: omap-usb3: Fix return value

The function returns a pointer. Hence return NULL instead of 0.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/phy/phy-omap-usb3.c b/drivers/usb/phy/phy-omap-usb3.c
index fc15694..4e8a040 100644
--- a/drivers/usb/phy/phy-omap-usb3.c
+++ b/drivers/usb/phy/phy-omap-usb3.c
@@ -79,7 +79,7 @@
 			return &dpll_map[i].params;
 	}
 
-	return 0;
+	return NULL;
 }
 
 static int omap_usb3_suspend(struct usb_phy *x, int suspend)