ath11k: Fix uninitialized symbol 'rx_buf_sz'

Add missing else statement in ath11k_dp_rx_process_mon_status()
to fix below smatch warnings,
    drivers/net/wireless/ath/ath11k/dp_rx.c:3105
    ath11k_dp_rx_process_mon_status()
    error: uninitialized symbol 'rx_buf_sz'.

Fixes: ab18e3b ("ath11k: Fix pktlog lite rx events")

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Anilkumar Kolli <quic_akolli@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/1642605793-13518-1-git-send-email-quic_akolli@quicinc.com

drivers/net/wireless/ath/ath11k/debugfs.h

@@ -88,6 +88,7 @@ enum ath11k_pktlog_mode {
 };
 
 enum ath11k_pktlog_enum {
+	ATH11K_PKTLOG_TYPE_INVALID      = 0,
 	ATH11K_PKTLOG_TYPE_TX_CTRL      = 1,
 	ATH11K_PKTLOG_TYPE_TX_STAT      = 2,
 	ATH11K_PKTLOG_TYPE_TX_MSDU_ID   = 3,

drivers/net/wireless/ath/ath11k/dp_rx.c

@@ -5054,7 +5054,7 @@ int ath11k_dp_rx_process_mon_status(struct ath11k_base *ab, int mac_id,
 	struct ath11k_sta *arsta;
 	int num_buffs_reaped = 0;
 	u32 rx_buf_sz;
-	u16 log_type = 0;
+	u16 log_type;
 	struct ath11k_mon_data *pmon = (struct ath11k_mon_data *)&ar->dp.mon_data;
 	struct ath11k_pdev_mon_stats *rx_mon_stats = &pmon->rx_mon_stats;
 	struct hal_rx_mon_ppdu_info *ppdu_info = &pmon->mon_ppdu_info;
@@ -5076,9 +5076,12 @@ int ath11k_dp_rx_process_mon_status(struct ath11k_base *ab, int mac_id,
 		} else if (ath11k_debugfs_is_pktlog_rx_stats_enabled(ar)) {
 			log_type = ATH11K_PKTLOG_TYPE_RX_STATBUF;
 			rx_buf_sz = DP_RX_BUFFER_SIZE;
+		} else {
+			log_type = ATH11K_PKTLOG_TYPE_INVALID;
+			rx_buf_sz = 0;
 		}
 
-		if (log_type)
+		if (log_type != ATH11K_PKTLOG_TYPE_INVALID)
 			trace_ath11k_htt_rxdesc(ar, skb->data, log_type, rx_buf_sz);
 
 		hal_status = ath11k_hal_rx_parse_mon_status(ab, ppdu_info, skb);