5218 posix definition of NULL
correct unistd.h and iso/stddef_iso.h
update gate source affected

@@ -730,11 +730,11 @@
         {SADB_X_IDENTTYPE_ADDR_RANGE,   "ipv4-range"},
         {SADB_X_IDENTTYPE_ADDR_RANGE,   "ipv6-range"},
         {SADB_X_IDENTTYPE_ADDR_RANGE,   "rangev4"},
         {SADB_X_IDENTTYPE_ADDR_RANGE,   "rangev6"},
         {SADB_X_IDENTTYPE_KEY_ID,       "keyid"},
-        {NULL,  0}
+        {0, NULL}
 };
 
 static int
 parse_idtype(char *type, uint16_t *idnum)
 {

@@ -898,11 +898,11 @@
         {PSFLD_LOCIDTYPE,       "localidtype"},
         {PSFLD_REMID,           "remoteid"},
         {PSFLD_REMIDTYPE,       "remoteidtype"},
         {PSFLD_MODE,            "ike_mode"},
         {PSFLD_KEY,             "key"},
-        {NULL,  0}
+        {0, NULL}
 };
 
 static int
 parse_psfldid(char *type, uint16_t *idnum)
 {

@@ -924,11 +924,11 @@
 
 static keywdtab_t       ikemodes[] = {
         {IKE_XCHG_IDENTITY_PROTECT,     "main"},
         {IKE_XCHG_AGGRESSIVE,           "aggressive"},
         {IKE_XCHG_IP_AND_AGGR,          "both"},
-        {NULL,  0}
+        {0, NULL}
 };
 
 static int
 parse_ikmtype(char *mode, uint16_t *modenum)
 {

@@ -3343,11 +3343,11 @@
         case IKE_SVC_DUMP_GROUPS:
         case IKE_SVC_DUMP_ENCRALGS:
         case IKE_SVC_DUMP_AUTHALGS:
         case IKE_SVC_DUMP_PS:
         case IKE_SVC_DUMP_CERTCACHE:
-                if (argc != NULL) {
+                if (argc != 0) {
                         print_dump_help();
                         break;
                 }
                 do_dump(cmd);
                 break;