iwlwifi: pcie: Refactor iwl_queue_space
iwlwifi: pcie: Refactor iwl_queue_space

Reduce the ambiguity spares to a single element if the window size is not
smaller than the queue size. If smaller, no spares are required at all.

Signed-off-by: Ido Yariv <9bf660e90dbb8f09e938a5703dac0e6c6d0031d5@wizery.com>
Signed-off-by: Johannes Berg <bff32994ff0f8d048f262a8388145a71b6071bfe@intel.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs