usb: renesas_usbhs: gadget: fix return value check in usbhs_mod_gadget_probe()

In case of error, the function usb_get_phy() returns ERR_PTR() and never
returns NULL. The NULL test in the return value check should be replaced
with IS_ERR().

Fixes: b5a2875 ("usb: renesas_usbhs: Allow an OTG PHY driver to
	provide VBUS")
Cc: <[email protected]> # v4.3+
Acked-by: Yoshihiro Shimoda <[email protected]>
Signed-off-by: Wei Yongjun <[email protected]>
Signed-off-by: Felipe Balbi <[email protected]>

Author: weiyj

drivers/usb/renesas_usbhs/mod_gadget.c

@@ -1076,7 +1076,7 @@ int usbhs_mod_gadget_probe(struct usbhs_priv *priv)
 
 	gpriv->transceiver = usb_get_phy(USB_PHY_TYPE_UNDEFINED);
 	dev_info(dev, "%stransceiver found\n",
-		 gpriv->transceiver ? "" : "no ");
+		 !IS_ERR(gpriv->transceiver) ? "" : "no ");
 
 	/*
 	 * CAUTION