irqchip/ls-scfg-msi: Switch to devm_bitmap_zalloc()

Switch to devm_bitmap_zalloc() to show clearly what we are allocating.
Besides that it returns pointer of bitmap type instead of opaque void *.

Signed-off-by: Andy Shevchenko <[e-mail]>
Signed-off-by: Marc Zyngier <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/irqchip/irq-ls-scfg-msi.c

···
 
 	msi_data->irqs_num = MSI_IRQS_PER_MSIR *
 			     (1 << msi_data->cfg->ibs_shift);
-	msi_data->used = devm_kcalloc(&pdev->dev,
-				    BITS_TO_LONGS(msi_data->irqs_num),
-				    sizeof(*msi_data->used),
-				    GFP_KERNEL);
+	msi_data->used = devm_bitmap_zalloc(&pdev->dev, msi_data->irqs_num, GFP_KERNEL);
 	if (!msi_data->used)
 		return -ENOMEM;
 	/*