ide: remove set but not used variable 'hwif'

Fix the following gcc warning:

drivers/ide/pmac.c: In function pmac_ide_setup_device:
drivers/ide/pmac.c:1027:14: warning: variable hwif set but not used
[-Wunused-but-set-variable]

Fixes: d58b0c39 ("powerpc/macio: Rework hotplug media bay support")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wang Hai <wanghai38@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/ide/pmac.c

@@ -1019,7 +1019,6 @@ static int pmac_ide_setup_device(pmac_ide_hwif_t *pmif, struct ide_hw *hw)
 	struct device_node *np = pmif->node;
 	const int *bidp;
 	struct ide_host *host;
-	ide_hwif_t *hwif;
 	struct ide_hw *hws[] = { hw };
 	struct ide_port_info d = pmac_port_info;
 	int rc;
@@ -1075,7 +1074,7 @@ static int pmac_ide_setup_device(pmac_ide_hwif_t *pmif, struct ide_hw *hw)
 		rc = -ENOMEM;
 		goto bail;
 	}
-	hwif = pmif->hwif = host->ports[0];
+	pmif->hwif = host->ports[0];
 
 	if (on_media_bay(pmif)) {
 		/* Fixup bus ID for media bay */