Fix the same byte waste issue in heap_2

Signed-off-by: Gaurav Aggarwal <[email protected]>

Author: aggarg

portable/MemMang/heap_2.c

@@ -266,7 +266,7 @@ static void prvHeapInit( void )
     uint8_t * pucAlignedHeap;
 
     /* Ensure the heap starts on a correctly aligned boundary. */
-    pucAlignedHeap = ( uint8_t * ) ( ( ( portPOINTER_SIZE_TYPE ) & ucHeap[ portBYTE_ALIGNMENT ] ) & ( ~( ( portPOINTER_SIZE_TYPE ) portBYTE_ALIGNMENT_MASK ) ) );
+    pucAlignedHeap = ( uint8_t * ) ( ( ( portPOINTER_SIZE_TYPE ) & ucHeap[ portBYTE_ALIGNMENT - 1 ] ) & ( ~( ( portPOINTER_SIZE_TYPE ) portBYTE_ALIGNMENT_MASK ) ) );
 
     /* xStart is used to hold a pointer to the first item in the list of free
      * blocks.  The void cast is used to prevent compiler warnings. */