Why is the last code line (array element initialization) in the code below being cited for 13.6 violation by Crystal Revs MISRA checker:
"Numeric variables being used within a for loop for iteration counting shall not be modified in the body of the loop"

/*Test code for Crystal revs MISRA rule 13.6 */
typedef unsigned char uint8_t
void InitArray(void);

#define LCD_NUM_OF_COLS 2u
#define LCD_NUM_OF_ROWS	10u
uint8_t Test_Array[LCD_NUM_OF_COLS][LCD_NUM_OF_ROWS];

void InitArray(void)
	{
	uint8_t row_index = 0u;
	uint8_t col_index = 0u;	
	for (col_index = 0u; col_index < LCD_NUM_OF_COLS; col_index++)
		{
		for (row_index=0u; row_index < LCD_NUM_OF_ROWS; row_index++)	
			{
			/*	make each element of the array the char NULL	*/
			Test_Array[col_index][row_index] = 0u;	
			}	
		}
	}