Fix incorrect test in super1.c

Refernces: bnc#699667

The dev_roles array has 16bit fields, we need to byteswap
'raid_disk' as a 16bit number before comparing against dev_roles.

This bug only affect big-endian machines and can cause a meaningless warning:
   wrong state in superblock

and could in unusual circumstances cause array assembly to fail.

Signed-off-by: NeilBrown <neilb@suse.de>
---
 super1.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- mdadm-3.0.3.orig/super1.c
+++ mdadm-3.0.3/super1.c
@@ -659,7 +659,7 @@ static int update_super1(struct supertyp
 		int d = info->disk.number;
 		int want;
 		if (info->disk.state == 6)
-			want = __cpu_to_le32(info->disk.raid_disk);
+			want = __cpu_to_le16(info->disk.raid_disk);
 		else
 			want = 0xFFFF;
 		if (sb->dev_roles[d] != want) {