lib: change http client path assignment

- change http client path assignment from  to  (it's more
appropriate in this case).
- since the inner condition is the only referencing the variable, moved
the assignment to the inner condition.

PR-URL: #35508
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Gerhard Stöbich <deb2001-github@yahoo.de>
Reviewed-By: Ricky Zhou <0x19951125@gmail.com>

lib/_http_client.js

@@ -141,9 +141,8 @@ function ClientRequest(input, options, cb) {
   if (this.agent && this.agent.protocol)
     expectedProtocol = this.agent.protocol;
 
-  let path;
   if (options.path) {
-    path = String(options.path);
+    const path = String(options.path);
     if (INVALID_PATH_REGEX.test(path))
       throw new ERR_UNESCAPED_CHARACTERS('Request path');
   }