[PATCH] USB: Fix irda-usb use after use

Don't read from free'd memory after calling netif_rx().  docopy is used as
a boolean (0 and 1) so unsigned int is sufficient.

Coverity bug #928

Signed-off-by: Eugene Teo <eugene.teo@eugeneteo.net>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>