krb5 commit: Fix config realm change logic in FILE remove_cred

[Greg Hudson]

https://github.com/krb5/krb5/commit/e5367fcddd53dc4db0c1fd2279e91eda3791960a
commit e5367fcddd53dc4db0c1fd2279e91eda3791960a
Author: Greg Hudson <ghudson at mit.edu>
Date:   Tue Apr 16 10:47:35 2019 -0400

    Fix config realm change logic in FILE remove_cred
    
    Use data_eq_string() to check the server realm, and do not check if
    cred->server is NULL since it is not expected to be (and
    k5_marshal_cred() would have already crashed if it were).
    
    ticket: 8792

 src/lib/krb5/ccache/cc_file.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/src/lib/krb5/ccache/cc_file.c b/src/lib/krb5/ccache/cc_file.c
index 91a77bf..f0f1409 100644
--- a/src/lib/krb5/ccache/cc_file.c
+++ b/src/lib/krb5/ccache/cc_file.c
@@ -1058,8 +1058,7 @@ delete_cred(krb5_context context, krb5_ccache cache, krb5_cc_cursor *cursor,
 
     /* For config entries, also change the realm so that other implementations
      * won't match them. */
-    if (cred->server != NULL && cred->server->realm.length > 0 &&
-        strcmp(cred->server->realm.data, "X-CACHECONF:") == 0)
+    if (data_eq_string(cred->server->realm, "X-CACHECONF:"))
         memcpy(cred->server->realm.data, "X-RMED-CONF:", 12);
 
     k5_marshal_cred(&overwrite, fcursor->version, cred);