wifi: rtlwifi: set initial values for unexpected cases of USB endpoint priority

Map USB endpoints to hardware and AC queues according to number of USB
endpoints. However, original only give a warning for unexpected cases but
initial values are not given. Then, smatch warns:

drivers/net/wireless/realtek/rtlwifi/rtl8192cu/hw.c:642
  _rtl92cu_init_chipn_two_out_ep_priority() error: uninitialized symbol 'valuelow'.
drivers/net/wireless/realtek/rtlwifi/rtl8192cu/hw.c:644
  _rtl92cu_init_chipn_two_out_ep_priority() error: uninitialized symbol 'valuehi'.
drivers/net/wireless/realtek/rtlwifi/rtl8192cu/hw.c:649
  _rtl92cu_init_chipn_two_out_ep_priority() error: uninitialized symbol 'valuehi'.
drivers/net/wireless/realtek/rtlwifi/rtl8192cu/hw.c:650
  _rtl92cu_init_chipn_two_out_ep_priority() error: uninitialized symbol 'valuelow'.

The regular selection is high and low queues, so move default (unexpected)
case along with that.

Compile tested only.
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/20240216033949.34765-1-pkshih@realtek.com

drivers/net/wireless/realtek/rtlwifi/rtl8192cu/hw.c

@@ -622,6 +622,9 @@ static void _rtl92cu_init_chipn_two_out_ep_priority(struct ieee80211_hw *hw,
 	u16 valuelow;
 
 	switch (queue_sel) {
+	default:
+		WARN_ON(1);
+		fallthrough;
 	case (TX_SELE_HQ | TX_SELE_LQ):
 		valuehi = QUEUE_HIGH;
 		valuelow = QUEUE_LOW;
@@ -634,9 +637,6 @@ static void _rtl92cu_init_chipn_two_out_ep_priority(struct ieee80211_hw *hw,
 		valuehi = QUEUE_HIGH;
 		valuelow = QUEUE_NORMAL;
 		break;
-	default:
-		WARN_ON(1);
-		break;
 	}
 	if (!wmm_enable) {
 		beq = valuelow;