rtlwifi: fix uninitialized rtlhal->last_suspend_sec time

We set rtlhal->last_suspend_sec to an uninitialized stack variable,
but unfortunately gcc never warned about this, I only found it
while working on another patch. I opened a gcc bug for this.

Presumably the value of rtlhal->last_suspend_sec is not all that
important, but it does get used, so we probably want the
patch backported to stable kernels.

Cc: [email protected]
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82839
Signed-off-by: Arnd Bergmann <[email protected]>
Acked-by: Larry Finger <[email protected]>
Signed-off-by: Kalle Valo <[email protected]>

drivers/net/wireless/realtek/rtlwifi/rtl8821ae/hw.c

@@ -1373,6 +1373,7 @@ static void _rtl8821ae_get_wakeup_reason(struct ieee80211_hw *hw)
 
 	ppsc->wakeup_reason = 0;
 
+	do_gettimeofday(&ts);
 	rtlhal->last_suspend_sec = ts.tv_sec;
 
 	switch (fw_reason) {