[sr-dev] [kamailio/kamailio] incomplete values and Wrong Counting for $hfl and $hflc (Issue #3194)

[patrickarton]

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### Description
the counting and values provides by $hfl and $hflc are wrong and imcomplete

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### Troubleshooting

#### Reproduction

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#### Debugging Data

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```
route {
    $var(hname) = "Record-Route";
    if (is_present_hf_pv("$var(hname)")){

        $var(i) = 0;
        $var(hdrc) = $hflc($var(hname));
		xlog("there are $var(hdrc) values for $var(hname)\r\n");
		xlog("------------------------------------------\r\n");		
		
		while ($var(i) < $var(hdrc)){
			$var(val) = $(hfl($var(hname))[$var(i)]);
			$var(sip_header_ip) = $(var(val){nameaddr.uri}{uri.host});
			if ($var(sip_header_ip) != 0){
				xlog("checking $var(sip_header_ip) in $var(hname) \r\n");
			}
			$var(i) = $var(i) + 1;


		}
	}
}

```

#### Log Messages

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```
 0(3729) ERROR: <script>: there are 2 values for Record-Route
 0(3729) ERROR: <script>: ------------------------------------------
 0(3729) ERROR: <script>: checking 1.1.1.1 in Record-Route
 0(3729) ERROR: <script>: checking 2.2.2.2 in Record-Route
```


#### Expected Results
```
 0(3729) ERROR: <script>: there are 3 values for Record-Route
 0(3729) ERROR: <script>: ------------------------------------------
 0(3729) ERROR: <script>: checking 1.1.1.1 in Record-Route
 0(3729) ERROR: <script>: checking 2.2.2.2 in Record-Route
 0(3729) ERROR: <script>: checking 3.3.3.3 in Record-Route
```


#### SIP Traffic

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If the issue is exposed by processing specific SIP messages, grab them with ngrep or save in a pcap file, then add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site).
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```
INVITE sip:+3226200866;trunk=PkGHOlui at 127.0.0.1:5060;cid=EMDLfGdgrDD SIP/2.0
Via: SIP/2.0/UDP 127.0.0.1:3030;branch=z9hG4bK-3708-1-0
Record-Route: <sip:1.1.1.1;lr=on;nat=yes>
Record-Route: <sip:2.2.2.2:5060;lr;transport=udp>,<sip:3.3.3.3:22506;lr;transport=udp>
From: <sip:8325000000 at 127.0.0.1:5060>;tag=3708SIPpTag091
To: <sip:++212-94939-43433226200866 at 127.0.0.1:5060>
Call-ID: 1-3708 at 127.0.0.1
CSeq: 1 INVITE
Max-Forwards: 70
Content-Type: application/sdp
```

### Possible Solutions

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### Additional Information

  * **Kamailio Version** - output of `kamailio -v`

```
version: kamailio 5.6.1 (x86_64/linux)
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLOCKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED
ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: unknown
compiled with gcc 10.2.1
```

* **Operating System**:

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```
(paste your output here)
```


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