src/http/modules/ngx_http_limit_req_module.c:621: error: Integer Overflow L2
  ([0, +oo] - 1):unsigned64.

src/http/modules/ngx_http_limit_req_module.c:621:13: <LHS trace>
619.         if (value[i].data[0] == '$') {
620. 
621.             value[i].len--;
                 ^
622.             value[i].data++;
623. 

src/http/modules/ngx_http_limit_req_module.c:621:13: Assignment
619.         if (value[i].data[0] == '$') {
620. 
621.             value[i].len--;
                 ^
622.             value[i].data++;
623. 

src/http/modules/ngx_http_limit_req_module.c:629:26: Call
627.             }
628. 
629.             ctx->index = ngx_http_get_variable_index(cf, &value[i]);
                              ^
630.             if (ctx->index == NGX_ERROR) {
631.                 return NGX_CONF_ERROR;

src/http/ngx_http_variables.c:322:1: Parameter `name->len`
  320. 
  321. 
  322. ngx_int_t
       ^
  323. ngx_http_get_variable_index(ngx_conf_t *cf, ngx_str_t *name)
  324. {

src/http/modules/ngx_http_limit_req_module.c:621:13: Binary operation: ([0, +oo] - 1):unsigned64
619.         if (value[i].data[0] == '$') {
620. 
621.             value[i].len--;
                 ^
622.             value[i].data++;
623. 
