s390/setup: convert start and end initrd pointers to virtual

Variables initrd_start and initrd_end are expected to hold
virtual memory pointers, not physical.
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

arch/s390/kernel/setup.c

@@ -719,7 +719,7 @@ static void __init reserve_initrd(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 	if (!initrd_data.start || !initrd_data.size)
 		return;
-	initrd_start = initrd_data.start;
+	initrd_start = (unsigned long)__va(initrd_data.start);
 	initrd_end = initrd_start + initrd_data.size;
 	memblock_reserve(initrd_data.start, initrd_data.size);
 #endif