server/util_expr_eval.c:920: error: UNINITIALIZED_VALUE
  The value read from result was never initialized.

server/util_expr_eval.c:920:9: 
918.     rc = ap_expr_exec_ctx(&ctx);
919.     if (rc > 0)
920.         return result;
             ^
921.     else if (rc < 0)
922.         return NULL;
