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

@@ -99,12 +99,11 @@
 #endif /* _KERNEL */
  },
     { ENCTYPE_DES_CBC_RAW,
       "des-cbc-raw", "DES cbc mode raw",
       &krb5int_enc_des, NULL,
-      krb5_raw_encrypt_length, krb5_raw_encrypt, krb5_raw_decrypt,
-      NULL,
+      krb5_raw_encrypt_length, krb5_raw_encrypt, krb5_raw_decrypt, 0,
 #ifndef _KERNEL
       krb5int_des_string_to_key,
 #else
       SUN_CKM_DES_CBC,
       NULL,

@@ -114,12 +113,11 @@
 },
 
     { ENCTYPE_DES3_CBC_RAW,
       "des3-cbc-raw", "Triple DES cbc mode raw",
       &krb5int_enc_des3, NULL,
-      krb5_raw_encrypt_length, krb5_raw_encrypt, krb5_raw_decrypt,
-      NULL,
+      krb5_raw_encrypt_length, krb5_raw_encrypt, krb5_raw_decrypt, 0,
 #ifndef _KERNEL
       krb5int_dk_string_to_key,
 #else
       SUN_CKM_DES3_CBC,
       NULL,

@@ -189,12 +187,11 @@
 },
 
     { ENCTYPE_DES_HMAC_SHA1,
       "des-hmac-sha1", "DES with HMAC/sha1",
       &krb5int_enc_des, &krb5int_hash_sha1,
-      krb5_dk_encrypt_length, krb5_dk_encrypt, krb5_dk_decrypt,
-      NULL,
+      krb5_dk_encrypt_length, krb5_dk_encrypt, krb5_dk_decrypt, 0,
 #ifndef _KERNEL
       krb5int_dk_string_to_key,
 #else
       SUN_CKM_DES_CBC,
       SUN_CKM_SHA1_HMAC,