firewire: replace subtraction with bitwise and
Replace an unnecessary subtraction with a bitwise AND when determining the value of ext_tcode in fw_fill_transaction() to save a cpu cycle or two in a somewhat critical path. Signed-off-by: NJarod Wilson <jwilson@redhat.com> Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>
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