iwlwifi: do not call ieee80211_frequency_to_channel
A few cases in iwlwifi driver function ieee80211_frequency_to_channel() is called to get channel number from center frequency. This is not needed since the channel number is already saved in hw_value field of struct ieee80211_channel in function iwlcore_init_geos(). So replace those function calls with hw_value field of struct ieee80211_channel. Signed-off-by: NShanyu Zhao <shanyu.zhao@intel.com> Signed-off-by: NJohannes Berg <johannes.berg@intel.com> Signed-off-by: NWey-Yi Guy <wey-yi.w.guy@intel.com>
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