USB: add URB_FREE_BUFFER to permissible flags

patch 0b28baaf in mainline.

URB_FREE_BUFFER needs to be allowed in the sanity checks to use drivers that
use that flag.
Signed-off-by: Oliver Neukum <oneukum@suse.de>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/core/urb.c

@@ -358,7 +358,7 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
 
 	/* enforce simple/standard policy */
 	allowed = (URB_NO_TRANSFER_DMA_MAP | URB_NO_SETUP_DMA_MAP |
-			URB_NO_INTERRUPT);
+			URB_NO_INTERRUPT | URB_FREE_BUFFER);
 	switch (temp) {
 	case PIPE_BULK:
 		if (is_out)