bugfix: suppressed the gcc warning "comparison between signed and unsigned integer expressions".

Author: agentzh

src/ngx_http_lua_socket_tcp.c

@@ -2711,7 +2711,7 @@ ngx_http_lua_socket_tcp_settimeout(lua_State *L)
     }
 
     timeout = (ngx_int_t) lua_tonumber(L, 2);
-    if (timeout > NGX_MAX_INT32_VALUE) {
+    if (timeout > (ngx_int_t) NGX_MAX_INT32_VALUE) {
         return luaL_error(L, "lua tcp socket timeout %f will overflow",
                           (lua_Number) timeout);
     }
@@ -2759,19 +2759,19 @@ ngx_http_lua_socket_tcp_settimeouts(lua_State *L)
     }
 
     connect_timeout = (ngx_int_t) lua_tonumber(L, 2);
-    if (connect_timeout > NGX_MAX_INT32_VALUE) {
+    if (connect_timeout > (ngx_int_t) NGX_MAX_INT32_VALUE) {
         return luaL_error(L, "lua tcp socket connect timeout %f will overflow",
                           (lua_Number) connect_timeout);
     }
 
     send_timeout = (ngx_int_t) lua_tonumber(L, 3);
-    if (send_timeout > NGX_MAX_INT32_VALUE) {
+    if (send_timeout > (ngx_int_t) NGX_MAX_INT32_VALUE) {
         return luaL_error(L, "lua tcp socket send timeout %f will overflow",
                           (lua_Number) send_timeout);
     }
 
     read_timeout = (ngx_int_t) lua_tonumber(L, 4);
-    if (read_timeout > NGX_MAX_INT32_VALUE) {
+    if (read_timeout > (ngx_int_t) NGX_MAX_INT32_VALUE) {
         return luaL_error(L, "lua tcp socket read timeout %f will overflow",
                           (lua_Number) read_timeout);
     }