ipa-kdb: unexpected error code in 'ipa_kdb_audit_as_req' triggers a message

This patch is related this defect reported by covscan on FreeIPA master:

"""
Error: DEADCODE (CWE-561):
/daemons/ipa-kdb/ipa_kdb_audit_as.c:42: cond_const: Condition "error_code !=
-1765328353L", taking false branch. Now the value of "error_code" is equal to
-1765328353.
/daemons/ipa-kdb/ipa_kdb_audit_as.c:42: cond_const: Condition
"error_code != -1765328360L", taking false branch. Now the value of
"error_code" is equal to -1765328360.
/daemons/ipa-kdb/ipa_kdb_audit_as.c:42:
cond_const: Condition "error_code != 0", taking false branch. Now the value of
"error_code" is equal to 0.
/daemons/ipa-kdb/ipa_kdb_audit_as.c:71:
intervals: When switching on "error_code", the value of "error_code" must be
in one of the following intervals: {[-1765328360,-1765328360],
[-1765328353,-1765328353], [0,0]}.
/daemons/ipa-kdb/ipa_kdb_audit_as.c:71:
dead_error_condition: The switch value "error_code" cannot reach the default
case.
/daemons/ipa-kdb/ipa_kdb_audit_as.c:123: dead_error_begin: Execution
cannot reach this statement: "default:".
"""

This patch is a part of series related to
https://fedorahosted.org/freeipa/ticket/4795.

Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>

daemons/ipa-kdb/ipa_kdb_audit_as.c

@@ -20,6 +20,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <syslog.h>
 #include "ipa_kdb.h"
 #include "ipa_pwd.h"
 
@@ -121,6 +122,9 @@ void ipadb_audit_as_req(krb5_context kcontext,
         client->mask |= KMASK_LAST_FAILED;
         break;
     default:
+        krb5_klog_syslog(LOG_ERR,
+                         "File '%s' line %d: Got an unexpected value of "
+                         "error_code: %d\n", __FILE__, __LINE__, error_code);
         return;
     }
 

daemons/ipa-kdb/ipa_kdb_mspac.c

@@ -54,9 +54,6 @@ struct ipadb_mspac {
     time_t last_update;
 };
 
-
-int krb5_klog_syslog(int, const char *, ...);
-
 static char *user_pac_attrs[] = {
     "objectClass",
     "uid",

util/ipa_krb5.h

@@ -30,6 +30,8 @@ struct keys_container {
 #define KEYTAB_RET_OID "2.16.840.1.113730.3.8.10.2"
 #define KEYTAB_GET_OID "2.16.840.1.113730.3.8.10.5"
 
+int krb5_klog_syslog(int, const char *, ...);
+
 void
 ipa_krb5_free_ktypes(krb5_context context, krb5_enctype *val);