USB: usb-storage: fix initializations of urb fields

Commit 0ede76fcec, "USB: remove uses of
URB_NO_SETUP_DMA_MAP" introduced a regression by inadvertantly removing
initialization of the transfer flags.  This caused initialization
failures in the ums-karma driver.  Fix the regression by zeroing it.

While at it, as Alan Stern points out, the initializers for
actual_length and status are handled by the core and error_count
only matters for isochronous urbs, so they don't need to be set here.
Remove them.

Signed-off-by: Bob Copeland <me@bobcopeland.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/storage/transport.c

@@ -139,9 +139,7 @@ static int usb_stor_msg_common(struct us_data *us, int timeout)
 
 	/* fill the common fields in the URB */
 	us->current_urb->context = &urb_done;
-	us->current_urb->actual_length = 0;
-	us->current_urb->error_count = 0;
-	us->current_urb->status = 0;
+	us->current_urb->transfer_flags = 0;
 
 	/* we assume that if transfer_buffer isn't us->iobuf then it
 	 * hasn't been mapped for DMA.  Yes, this is clunky, but it's