path: inline conditions

This condition can be inlined in the first `if` statement since
if the `path`'s length is 0, it'll be a empty string so we can
return that as there's no need for an extra `if` statement.

PR-URL: #38613
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

lib/path.js

@@ -617,13 +617,9 @@ const win32 = {
    */
   toNamespacedPath(path) {
     // Note: this will *probably* throw somewhere.
-    if (typeof path !== 'string')
+    if (typeof path !== 'string' || path.length === 0)
       return path;
 
-    if (path.length === 0) {
-      return '';
-    }
-
     const resolvedPath = win32.resolve(path);
 
     if (resolvedPath.length <= 2)