Staging: westbridge/astoria: unlock on error path

There is an unlock missing on this error path.
Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/westbridge/astoria/gadget/cyasgadget.c

@@ -587,6 +587,7 @@ static int cyasgadget_enable(
 			"cy_as_usb_end_point_config EP %s mismatch "
 			"on enabled\n", an_ep->usb_ep_inst.name);
 		#endif
+		spin_unlock_irqrestore(&an_dev->lock, flags);
 		return -EINVAL;
 	}