[PATCH v2 -next] btrfs: Remove unnecessary casts in btrfs_read_root_item

From: YueHaibing
Date: Wed Feb 20 2019 - 07:18:37 EST

There is a messy cast here:
min_t(int, len, (int)sizeof(*item)));

min_t() should normally cast to unsigned. It's not possible for
"len" to be negative, but if it were then we definitely
wouldn't want to pass negatives to read_extent_buffer(). Also there
is an extra cast.

This patch shouldn't affect runtime, it's just a clean up.

Suggested-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
v2: modify commit message as Dan suggested
fs/btrfs/root-tree.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/btrfs/root-tree.c b/fs/btrfs/root-tree.c
index 02d1a57af78b..893d12fbfda0 100644
--- a/fs/btrfs/root-tree.c
+++ b/fs/btrfs/root-tree.c
@@ -21,12 +21,12 @@ static void btrfs_read_root_item(struct extent_buffer *eb, int slot,
struct btrfs_root_item *item)
uuid_le uuid;
- int len;
+ u32 len;
int need_reset = 0;

len = btrfs_item_size_nr(eb, slot);
read_extent_buffer(eb, item, btrfs_item_ptr_offset(eb, slot),
- min_t(int, len, (int)sizeof(*item)));
+ min_t(u32, len, sizeof(*item)));
if (len < sizeof(*item))
need_reset = 1;
if (!need_reset && btrfs_root_generation(item)