ide: remove write-only hwif->hw

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/ppc/pmac.c b/drivers/ide/ppc/pmac.c
index 959afe4..816b531 100644
--- a/drivers/ide/ppc/pmac.c
+++ b/drivers/ide/ppc/pmac.c
@@ -1040,6 +1040,7 @@
 	struct device_node *np = pmif->node;
 	const int *bidp;
 	u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
+	hw_regs_t hw;
 
 	pmif->cable_80 = 0;
 	pmif->broken_dma = pmif->broken_dma_warn = 0;
@@ -1125,8 +1126,9 @@
 	/* Tell common code _not_ to mess with resources */
 	hwif->mmio = 1;
 	hwif->hwif_data = pmif;
-	pmac_ide_init_hwif_ports(&hwif->hw, pmif->regbase, 0, &hwif->irq);
-	memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->io_ports));
+	memset(&hw, 0, sizeof(hw));
+	pmac_ide_init_hwif_ports(&hw, pmif->regbase, 0, &hwif->irq);
+	memcpy(hwif->io_ports, hw.io_ports, sizeof(hwif->io_ports));
 	hwif->chipset = ide_pmac;
 	hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET] || pmif->mediabay;
 	hwif->hold = pmif->mediabay;