[sr-dev] [kamailio/kamailio] cfgutils: KEMI wrappers segfault as missing sig_msg_t* first argument (#1459)

[aalba6675]

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### Description

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Explain what you did, what you expected to happen, and what actually happened.
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Use KEMI cfgutils.lock() and cfgutils.unlock().

Expect native behaviour of lock() unlock().

Instead segfault.


### Troubleshooting
The KEMI wrappers do not have leading sip_msg_t* argument.

Wrapper for lock() is cfg_lock()

Prototype for cfg_lock() is static int cfg_lock(str *lkey). Notice the missing sig_msg_t * first argument.




#### Reproduction
Call cfgutils.lock() cfgutils.unlock() from scripting language



#### Debugging Data
#0  0x00007fdc6e7eff32 in core_case_hash (s1=0x7fdcb88ac1a0, s2=0x0, size=16) at ../../core/hashes.h:317
317                     v=(ch_icase(*p)<<24)+(ch_icase(p[1])<<16)+(ch_icase(p[2])<<8)

s1 is actually the sip_msg_t* not the lock key string.
*s1 can actually be deferenced as *(sip_msg_t*) s1

#### Log Messages
#### SIP Traffic

### Possible Solutions
KEMI wrappers for cfgutils.c should include dummy sip_msg_t* argument.

### Additional Information

  * 5.0 5.1 master - kamailio version


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