krb5 commit: Fix audit test module initialization

[Greg Hudson]

https://github.com/krb5/krb5/commit/5036f91e7b61a73a1ec2d39ce1cc6bbf60dd82ab
commit 5036f91e7b61a73a1ec2d39ce1cc6bbf60dd82ab
Author: Greg Hudson <ghudson at mit.edu>
Date:   Sat Oct 5 20:13:39 2013 -0400

    Fix audit test module initialization
    
    Check if the fopen result is NULL, not whether it's less than zero.
    
    ticket: 7713 (new)
    target_version: 1.12
    tags: pullups

 src/plugins/audit/test/au_test.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/src/plugins/audit/test/au_test.c b/src/plugins/audit/test/au_test.c
index 54bf564..76e711e 100644
--- a/src/plugins/audit/test/au_test.c
+++ b/src/plugins/audit/test/au_test.c
@@ -55,9 +55,8 @@ static krb5_error_code
 open_au(krb5_audit_moddata *auctx)
 {
     au_fd = fopen("au.log", "a+");
-    if ( au_fd < 0) {
+    if (au_fd == NULL)
         return KRB5_PLUGIN_NO_HANDLE; /* audit module is unavailable */
-    }
     k5_mutex_init(&lock);
     return 0;
 }