cfg80211: fix 6 GHz frequencies to kHz

The updates to change to kHz frequencies and the 6 GHz
additions evidently overlapped (or rather, I didn't see
it when applying the latter), so the 6 GHz is broken.
Fix this.

Fixes: 934f4c7dd3 ("cfg80211: express channels with a KHz component")
Link: https://lore.kernel.org/r/20200529140425.1bf824f6911b.I4a1174916b8f5965af4366999eb9ffc7a0347470@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/wireless/util.c

@@ -94,7 +94,7 @@ u32 ieee80211_channel_to_freq_khz(int chan, enum nl80211_band band)
 	case NL80211_BAND_6GHZ:
 		/* see 802.11ax D4.1 27.3.22.2 */
 		if (chan <= 253)
-			return 5940 + chan * 5;
+			return MHZ_TO_KHZ(5940 + chan * 5);
 		break;
 	case NL80211_BAND_60GHZ:
 		if (chan < 7)