ath9k_hw: use the devres API for allocations

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Acked-by: Luis R. Rodriguez <mcgrof@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/init.c b/drivers/net/wireless/ath/ath9k/init.c
index 0f00a13..5c01f43 100644
--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -559,6 +559,7 @@
 	if (!ah)
 		return -ENOMEM;
 
+	ah->dev = sc->dev;
 	ah->hw = sc->hw;
 	ah->hw_version.devid = devid;
 	ah->reg_ops.read = ath9k_ioread32;