iwlwifi: pcie: get rid of q->n_bd
This variable always tracks a constant value (256) so there's no need to have it. Removing it simplifies code generation, reducing the .text size (by about 240 bytes on x86-64.) Signed-off-by: NJohannes Berg <johannes.berg@intel.com> Signed-off-by: NEmmanuel Grumbach <emmanuel.grumbach@intel.com>
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