winhttp: Use an unsigned integer for number values in query_headers().

dlls/winhttp/request.c

@@ -734,15 +734,15 @@ static DWORD query_headers( struct request *request, DWORD level, const WCHAR *n
     if (!header || (request_only && !header->is_request)) return ERROR_WINHTTP_HEADER_NOT_FOUND;
     if (level & WINHTTP_QUERY_FLAG_NUMBER)
     {
-        if (!buffer || sizeof(int) > *buflen) ret = ERROR_INSUFFICIENT_BUFFER;
+        if (!buffer || sizeof(DWORD) > *buflen) ret = ERROR_INSUFFICIENT_BUFFER;
         else
         {
-            int *number = buffer;
-            *number = wcstol( header->value, NULL, 10 );
-            TRACE("returning number: %d\n", *number);
+            DWORD *number = buffer;
+            *number = wcstoul( header->value, NULL, 10 );
+            TRACE("returning number: %lu\n", *number);
             ret = ERROR_SUCCESS;
         }
-        *buflen = sizeof(int);
+        *buflen = sizeof(DWORD);
     }
     else if (level & WINHTTP_QUERY_FLAG_SYSTEMTIME)
     {