MIPS: i8259: Correct comment for i8259

The comment for the slave PIC is changed from 8259A-1 to 8259A-2.
Signed-off-by: Hillf Danton <dhillf@gmail.com>
To:  LKML <linux-kernel@vger.kernel.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2693/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/kernel/i8259.c

@@ -229,7 +229,7 @@ static void i8259A_shutdown(void)
 	 */
 	if (i8259A_auto_eoi >= 0) {
 		outb(0xff, PIC_MASTER_IMR);	/* mask all of 8259A-1 */
-		outb(0xff, PIC_SLAVE_IMR);	/* mask all of 8259A-1 */
+		outb(0xff, PIC_SLAVE_IMR);	/* mask all of 8259A-2 */
 	}
 }