lib/krb5: krcache add_unique_keyring dead code removal

After the for loop 'key' cannot have the value -1.  The loop
must execute at least once resulting either in the function
returning to the caller or the value of 'key' getting set to
a value other than -1.

Change-Id: Idaf65e3cf3d22a27828ad0dd04650a4f54ba94fc

lib/krb5/krcache.c

@@ -766,9 +766,6 @@ add_unique_keyring(krb5_context context,
 	}
     }
 
-    if (key == -1)
-	return KRB5_CC_BADNAME;
-
     *psubsidiary = strdup(uniquename);
     if (*psubsidiary == NULL)
 	return krb5_enomem(context);