ath5k: document a fall-through case in ath5k_hw_set_opmode

Coverity: CID 114932
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Acked-by: Nick Kossifidis <mickflemm@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/ath/ath5k/pcu.c

@@ -912,6 +912,7 @@ ath5k_hw_set_opmode(struct ath5k_hw *ah, enum nl80211_iftype op_mode)
 		pcu_reg |= AR5K_STA_ID1_KEYSRCH_MODE
 			| (ah->ah_version == AR5K_AR5210 ?
 				AR5K_STA_ID1_PWR_SV : 0);
+		/* fall through */
 	case NL80211_IFTYPE_MONITOR:
 		pcu_reg |= AR5K_STA_ID1_KEYSRCH_MODE
 			| (ah->ah_version == AR5K_AR5210 ?