staging: r8188eu: use ieee80211 helper to read the pwr bit

Use the ieee80211 helper to read the power management bit.
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220327180944.712545-3-martin@kaiser.cxSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/core/rtw_recv.c

@@ -1079,7 +1079,7 @@ static int validate_recv_frame(struct adapter *adapter, struct recv_frame *precv
 	pattrib->frag_num = GetFragNum(ptr);
 	pattrib->seq_num = GetSequence(ptr);
 
-	pattrib->pw_save = GetPwrMgt(ptr);
+	pattrib->pw_save = ieee80211_has_pm(fc);
 	pattrib->mfrag = ieee80211_has_morefrags(fc);
 	pattrib->mdata = ieee80211_has_moredata(fc);
 	pattrib->privacy = ieee80211_has_protected(fc);