lib/krb5: acc_resolve_2 leak if ccErrCacheNotFound

Fix the possible leak of 's' allocated by asprintf()

When squashing the changes reference "this fixes an issue introduced by 7bf4d76 ("krb5: Improve cccol sub naming; add gss_store_cred_into2()")" in the commit message.

lib/krb5/acache.c

@@ -560,7 +560,8 @@ acc_resolve_2(krb5_context context, krb5_ccache *id, const char *res, const char
     if (error == ccErrCCacheNotFound) {
         a->ccache = NULL;
         a->cache_name = NULL;
-        return 0;
+	free(s);
+	return 0;
     }
     if (error == ccNoError)
         error = get_cc_name(a);