Update 0101-symmetric-tree.js. Add space after control flow statement.

Author: aadil42

javascript/0101-symmetric-tree.js

@@ -14,17 +14,16 @@
  * @return {boolean}
  */
 var isSymmetric = function(root) {
+    return dfs(root.left, root.right);
+};
 
-    const dfs = (node1, node2) => {
-
-        if(!node1 && !node2) return true;
+const dfs = (node1, node2) => {
 
-        if(node1 && !node2) return false;
-        if(!node1 && node2) return false;
-        if(node1.val !== node2.val) return false;
+    if (!node1 && !node2) return true;
 
-        return dfs(node1.right, node2.left) && dfs(node1.left, node2.right);
-    }
+    if (node1 && !node2) return false;
+    if (!node1 && node2) return false;
+    if (node1.val !== node2.val) return false;
 
-    return dfs(root.left, root.right);
-};
+    return dfs(node1.right, node2.left) && dfs(node1.left, node2.right);
+}