ath9k: fix a chip wakeup related crash in ath9k_start

When the chip is still asleep when ath9k_start is called,
ath9k_hw_configpcipowersave can trigger a data bus error.

Signed-off-by: Felix Fietkau <[e-mail]>
Cc: [e-mail]
Signed-off-by: John W. Linville <[e-mail]>

drivers/net/wireless/ath/ath9k/main.c

···
 		"Starting driver with initial channel: %d MHz\n",
 		curchan->center_freq);
 
+	ath9k_ps_wakeup(sc);
+
 	mutex_lock(&sc->mutex);
 
 	/* setup initial channel */
···
 
 mutex_unlock:
 	mutex_unlock(&sc->mutex);
+
+	ath9k_ps_restore(sc);
 
 	return r;
 }