wifi: iwlwifi: Replace space with tabs as code indent

This patch addresses the checkpatch.pl warning that code indent should
use tabs.
Signed-off-by: Solomon Tan <solomonbstoner@protonmail.ch>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230314194113.eaca2a9b08f2.Ic81d60185c13cfc750bf93fbabac57314cb5de13@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>