staging: most: hdm-usb: remove calls to usb_unachor_urb

This patch removes the calls to usb_unanchor_urb() from the completion
routines, since disassociation of the URBs is already handles by the
USB subsystem.
Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/most/hdm-usb/hdm_usb.c

@@ -401,7 +401,6 @@ static void hdm_write_completion(struct urb *urb)
 			mbo->status = MBO_E_INVAL;
 			break;
 		}
-		usb_unanchor_urb(urb);
 	} else {
 		mbo->status = MBO_SUCCESS;
 		mbo->processed_length = urb->actual_length;
@@ -558,7 +557,6 @@ static void hdm_read_completion(struct urb *urb)
 			mbo->status = MBO_E_INVAL;
 			break;
 		}
-		usb_unanchor_urb(urb);
 	} else {
 		mbo->processed_length = urb->actual_length;
 		mbo->status = MBO_SUCCESS;