USB: qcserial: centralize probe exit path

Creating a common exit path from qcprobe to make it
easier to extend it.
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/serial/qcserial.c

@@ -157,10 +157,9 @@ static int qcprobe(struct usb_serial *serial, const struct usb_device_id *id)
 		    usb_endpoint_is_bulk_out(&intf->endpoint[1].desc)) {
 			dev_dbg(dev, "QDL port found\n");
 
-			if (serial->interface->num_altsetting == 1) {
+			if (serial->interface->num_altsetting == 1)
 				retval = 0; /* Success */
-				break;
-			}
+			else
 				altsetting = 1;
 		}
 		break;
@@ -203,8 +202,6 @@ static int qcprobe(struct usb_serial *serial, const struct usb_device_id *id)
 
 	default:
 		dev_err(dev, "unknown number of interfaces: %d\n", nintf);
-		kfree(data);
-		retval = -ENODEV;
 	}
 
 	if (altsetting >= 0) {
@@ -214,13 +211,15 @@ static int qcprobe(struct usb_serial *serial, const struct usb_device_id *id)
 				"Could not set interface, error %d\n",
 				retval);
 			retval = -ENODEV;
-			kfree(data);
 		}
 	}
 
-	/* Set serial->private if not returning -ENODEV */
-	if (retval != -ENODEV)
+	/* Set serial->private if not returning error */
+	if (retval == 0)
 		usb_set_serial_data(serial, data);
+	else
+		kfree(data);
+
 	return retval;
 }