lib/krb5: fcc_remove_cred return krb5_cc_end_seq_get failure

krb5_cc_end_seq_get() is not expected to fail because it is a
cleanup routine.  If it fails it indicates something wrong with
the cache or the system.  Return the failure if there is one.

Otherwise, the failure from krb5_cc_next_cred() should be
returned UNLESS it is KRB5_CC_END in which case return success.

Change-Id: I80e07103e2fb38aa40418a436fa5351fb89549d3

lib/krb5/fcache.c

@@ -1176,7 +1176,7 @@ fcc_remove_cred(krb5_context context,
 	krb5_free_cred_contents(context, &found_cred);
     }
     ret2 = krb5_cc_end_seq_get(context, id, &cursor);
-    if (ret == 0)
+    if (ret2)	/* not expected to fail */
 	return ret2;
     if (ret == KRB5_CC_END)
 	return 0;