Description of problem:
Segment fault when call log4c_init twice.

Version-Release number of selected component (if applicable):
1.2.4

How reproducible:


Steps to Reproduce:
1. call log4c_init
2. call log4c_fini
3. call log4c_init

Actual results:
Step 3 run sucessfully.

Expected results:
Segment fault & core dump

Additional info:
The code is below:
static sd_hash_t* log4c_layout_types(void)
{
    static sd_hash_t* types = NULL;

    if (!types)
	types = sd_hash_new(20, NULL);
    
    return types;
}

extern void log4c_layout_types_free( void ) {
	sd_hash_t * types = log4c_layout_types();
	if ( types != NULL ) {
		sd_hash_delete( types );
	}
}
"types" in function log4c_layout_types_free has delete, but the pointer need to be set to nullptr.
It need to change to code below:

static sd_hash_t* types = NULL;
static sd_hash_t* log4c_layout_types(void)
{
    if (!types)
	types = sd_hash_new(20, NULL);
    
    return types;
}

extern void log4c_layout_types_free( void ) {
    //sd_hash_t * types = log4c_layout_types();
    if ( types != NULL ) {
        sd_hash_delete( types );
    }
types = NULL;
}

The bug is existed in all packages, neither Fedora EPEL or EPEL for RHEL, in verison 1.2.4。