[PATCH] USB: musb: Avoid null pointer dereference in debug logging

[Maarten ter Huurne]

Since commit 511f3c53 (usb: gadget: udc-core: fix a regression during
gadget driver unbinding) usb_gadget_remove_driver will pass NULL for
the driver argument.

Signed-off-by: Maarten ter Huurne <maarten@xxxxxxxxxxxxxx>
---
 drivers/usb/musb/musb_gadget.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
index ba70923..82e5386 100644
--- a/drivers/usb/musb/musb_gadget.c
+++ b/drivers/usb/musb/musb_gadget.c
@@ -1935,7 +1935,8 @@ static int musb_gadget_stop(struct usb_gadget *g,
 	stop_activity(musb, driver);
 	otg_set_peripheral(musb->xceiv->otg, NULL);
 
-	dev_dbg(musb->controller, "unregistering driver %s\n", driver->function);
+	dev_dbg(musb->controller, "unregistering driver %s\n",
+				  driver ? driver->function : "(removed)");
 
 	musb->is_active = 0;
 	musb->gadget_driver = NULL;
-- 
1.8.1.4

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