src: remove unused variable in node_url.cc

PR-URL: https://github.com/nodejs/node/pull/15592
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: Minwoo Jung <minwoo@nodesource.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>

src/node_url.cc

@@ -1206,8 +1206,6 @@ void URL::Parse(const char* input,
 
   while (p <= end) {
     const char ch = p < end ? p[0] : kEOL;
-    const size_t remaining = end == p ? 0 : (end - p - 1);
-
     bool special = (url->flags & URL_FLAGS_SPECIAL);
     bool cannot_be_base;
     const bool special_back_slash = (special && ch == '\\');