wifi: mac80211: fix Spatial Reuse element size check

Currently, the way to check the size of Spatial Reuse IE data in the
ieee80211_parse_extension_element() is incorrect.

This is because the len variable in the ieee80211_parse_extension_element()
function is equal to the size of Spatial Reuse IE data minus one and the
value of returned by the ieee80211_he_spr_size() function is equal to
the length of Spatial Reuse IE data. So the result of the
len >= ieee80211_he_spr_size(data) statement always false.

To address this issue and make it consistent with the logic used elsewhere
with ieee80211_he_oper_size(), change the
"len >= ieee80211_he_spr_size(data)" to
“len >= ieee80211_he_spr_size(data) - 1”.

Fixes: 9d0480a7

 ("wifi: mac80211: move element parsing to a new file")
Signed-off-by: Lingbo Kong <quic_lingbok@quicinc.com>
Link: https://msgid.link/20240516021854.5682-2-quic_lingbok@quicinc.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>