iio:trigger:interrupt fix formatting of rsize variable in name

The name includes irq_res->start which of type resource_size_t not integer.
We could in theory use %pa for this but then it would be in hex and also
that causes a warning about incorrect types anyway.  Hence just
use the irq local variable we assigned the line above.
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/trigger/iio-trig-interrupt.c

@@ -50,7 +50,7 @@ static int iio_interrupt_trigger_probe(struct platform_device *pdev)
 
 	irq = irq_res->start;
 
-	trig = iio_trigger_alloc("irqtrig%d", irq_res->start);
+	trig = iio_trigger_alloc("irqtrig%d", irq);
 	if (!trig) {
 		ret = -ENOMEM;
 		goto error_ret;