thunderbolt: Introduce tb_port_next_cap()
This function is useful for walking port config space (adapter) capability lists. Convert the tb_port_find_cap() to use this as well. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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