wifi: ath12k: fix skb_ext_desc leak in ath12k_dp_tx() error path

[ Upstream commit 28a9972e0f0693cd4d08f431c992fa6be39c788c ]

When vlan support was added, we missed that when
ath12k_dp_prepare_htt_metadata() returns an error we also need to free
the skb holding the metadata before going on with the cleanup process.

Compile tested only.

Fixes: 26dd8ccdba ("wifi: ath12k: dynamic VLAN support")
Signed-off-by: Nicolas Escande <nico.escande@gmail.com>
Reviewed-by: Aditya Kumar Singh <aditya.kumar.singh@oss.qualcomm.com>
Link: https://patch.msgid.link/20250122160112.3234558-1-nico.escande@gmail.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
Stable-dep-of: 37a068fc9dc4 ("wifi: ath12k: Handle error cases during extended skb allocation")
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/net/wireless/ath/ath12k/dp_tx.c

@@ -397,6 +397,7 @@ map:
 			if (ret < 0) {
 				ath12k_dbg(ab, ATH12K_DBG_DP_TX,
 					   "Failed to add HTT meta data, dropping packet\n");
+				kfree_skb(skb_ext_desc);
 				goto fail_unmap_dma;
 			}
 		}