btrfs: cleanup, use correct type in div_u64_rem

div_u64_rem expects u32 for divisior and reminder.

Signed-off-by: David Sterba <dsterba@suse.cz>
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index bf38ed0..3df8353 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -4953,7 +4953,7 @@
 	u64 stripe_nr_orig;
 	u64 stripe_nr_end;
 	u64 stripe_len;
-	int stripe_index;
+	u32 stripe_index;
 	int i;
 	int ret = 0;
 	int num_stripes;
@@ -5171,7 +5171,7 @@
 		}
 
 	} else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
-		int factor = map->num_stripes / map->sub_stripes;
+		u32 factor = map->num_stripes / map->sub_stripes;
 
 		stripe_nr = div_u64_rem(stripe_nr, factor, &stripe_index);
 		stripe_index *= map->sub_stripes;
@@ -5262,7 +5262,8 @@
 	    need_raid_map && ((rw & (REQ_WRITE | REQ_GET_READ_MIRRORS)) ||
 	    mirror_num > 1)) {
 		u64 tmp;
-		int i, rot;
+		int i;
+		unsigned rot;
 
 		bbio->raid_map = (u64 *)((void *)bbio->stripes +
 				 sizeof(struct btrfs_bio_stripe) *
@@ -5285,8 +5286,8 @@
 	}
 
 	if (rw & REQ_DISCARD) {
-		int factor = 0;
-		int sub_stripes = 0;
+		u32 factor = 0;
+		u32 sub_stripes = 0;
 		u64 stripes_per_dev = 0;
 		u32 remaining_stripes = 0;
 		u32 last_stripe = 0;