Fix ignoring_due_to_kde stat

Summary:
TPR skips due to KDE in 2 places. We were not incrementing this stat in one of those places, hence missing the stat increase while debugging TPR issue.
Fixing it

Reviewed By: frankfeir

Differential Revision: D79908694

fbshipit-source-id: fa44834e38be486bbb7f8a2ce37dddd1109d17cc

Author: nikhildl12

katran/tpr/bpf/tcp_pkt_router.bpf.c

@@ -37,9 +37,13 @@ static inline int handle_passive_cb(
     case BPF_SOCK_OPS_HDR_OPT_LEN_CB:
       /* Reserve space for writing the header option later in
        * BPF_SOCK_OPS_WRITE_HDR_OPT_CB. */
-      if (((skops->skb_tcp_flags & TCPHDR_SYNACK) == TCPHDR_SYNACK) &&
-          !should_ignore_due_to_kde(skops)) {
+      if ((skops->skb_tcp_flags & TCPHDR_SYNACK) == TCPHDR_SYNACK) {
+        if (should_ignore_due_to_kde(skops)) {
+          stat->ignoring_due_to_kde++;
+          return SUCCESS;
+        }
         return handle_hdr_opt_len(skops, stat);
+
       } else {
         return SUCCESS;
       }