[media] Fix cx88 remote control input

In the IR interrupt handler of cx88-input.c there's a 32-bit multiply
overflow which causes IR pulse durations to be incorrectly calculated.

This is a regression caused by commit 2997137.

Cc: stable@kernel.org
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/cx88/cx88-input.c

@@ -524,7 +524,7 @@ void cx88_ir_irq(struct cx88_core *core)
 	for (todo = 32; todo > 0; todo -= bits) {
 		ev.pulse = samples & 0x80000000 ? false : true;
 		bits = min(todo, 32U - fls(ev.pulse ? samples : ~samples));
-		ev.duration = (bits * NSEC_PER_SEC) / (1000 * ir_samplerate);
+		ev.duration = (bits * (NSEC_PER_SEC / 1000)) / ir_samplerate;
 		ir_raw_event_store_with_filter(ir->dev, &ev);
 		samples <<= bits;
 	}