mac80211: fix ieee80211_he_oper_size() comment

Johannes mentioned that the comment should not reference mac80211 as other
subsystems might call the helper.

Signed-off-by: John Crispin <john@phrozen.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20190729102342.8659-1-john@phrozen.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

include/linux/ieee80211.h

@@ -2053,8 +2053,8 @@ ieee80211_he_ppe_size(u8 ppe_thres_hdr, const u8 *phy_cap_info)
  * ieee80211_he_oper_size - calculate 802.11ax HE Operations IE size
  * @he_oper_ie: byte data of the He Operations IE, stating from the the byte
  *	after the ext ID byte. It is assumed that he_oper_ie has at least
- *	sizeof(struct ieee80211_he_operation) bytes, checked already in
- *	ieee802_11_parse_elems_crc()
+ *	sizeof(struct ieee80211_he_operation) bytes, the caller must have
+ *	validated this.
  * @return the actual size of the IE data (not including header), or 0 on error
  */
 static inline u8