[sr-dev] [kamailio/kamailio] detailed_ipv4_type func pkg memory leak. (Issue #3159)

[杰哥]

### Description

when call detailed_ipv4_type function, pkg memory leak.
```c
detailed_ipv4_type($si,"$var(iptype)");
```


### Troubleshooting

#### Reproduction
just call detailed_ipv4_type function.

#### Debugging Data

```
ALERT: qm_sums: qm_sums():  count= 48161 size=   1789640 bytes from core: core/rvalue.c: rval_get_str(1293)

```

### Possible Solutions

ip address string not free in rval_get_str() function. [s->s=pkg_malloc(tmp.len+1/* 0 term */);](https://github.com/kamailio/kamailio/blob/1ddc27f199061025a6a43da3e8a1388fcaddfe19/src/core/rvalue.c#L1293)
need call pkg_free() free memory.

### Additional Information
test 3 version.
```
kamailio 5.5.4
kamailio 5.4.8
kamailio 5.3.9
```

* **Operating System**:
```
buster 10
ubuntu 20.04
```


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