CID 316784: Incorrect size passed to isc_mem_put

If a invalid key name is specified in a masters list the wrong size is passed to isc_mem_put.

*** CID 316784:  Incorrect expression  (SIZEOF_MISMATCH)
/bin/named/config.c: 636 in named_config_getname()
630     	isc_buffer_constinit(&b, objstr, strlen(objstr));
631     	isc_buffer_add(&b, strlen(objstr));
632     	dns_fixedname_init(&fname);
633     	result = dns_name_fromtext(dns_fixedname_name(&fname), &b, dns_rootname,
634     				   0, NULL);
635     	if (result != ISC_R_SUCCESS) {
   CID 316784:  Incorrect expression  (SIZEOF_MISMATCH)
   Passing argument "*namep" of type "dns_name_t *" and argument "8UL /* sizeof (*namep) */" to function "isc__mem_put" is suspicious.
636     		isc_mem_put(mctx, *namep, sizeof(*namep));
637     		*namep = NULL;
638     		return (result);
639     	}
640     	dns_name_dup(dns_fixedname_name(&fname), mctx, *namep);
641