remove unused variable

Author: EAlexan

Misc/heap_sort.java

@@ -57,8 +57,7 @@ static void printArray(int[] arr) {
     // Driver program
     public static void main(String args[]) {
         int arr[] = {12, 11, 13, 5, 6, 7};
-        int n = arr.length;
-
+        
         heap_sort ob = new heap_sort();
         ob.sort(arr);