Fix

Author: hoodmane

src/library_fs.js

@@ -1053,10 +1053,11 @@ FS.staticInit();
         mode = 0;
       }
       var node;
-      var isDirPath = path.endsWith("/");
+      var isDirPath;
       if (typeof path == 'object') {
         node = path;
       } else {
+        isDirPath = path.endsWith("/");
         // noent_okay makes it so that if the final component of the path
         // doesn't exist, lookupPath returns `node: undefined`. `path` will be
         // updated to point to the target of all symlinks.