btrfs: scrub: remove redundant division of stripe_nr

Variable stripe_nr is being divided by map->num_stripes however the
result is never read. The division and assignment are redundant and
can be removed. Cleans up clang scan build warning:

fs/btrfs/scrub.c:1264:3: warning: Value stored to 'stripe_nr' is
never read [deadcode.DeadStores]

The code is a leftover from 6ded22c1bfe6 ("btrfs: reduce div64 calls by
limiting the number of stripes of a chunk to u32") that converted div64
to normal division, it's the same but previous version did not trigger a
warning.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index 7289f5b..fe1c5bc 100644 (file)
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -1262,7 +1262,6 @@ static int get_raid56_logic_offset(u64 physical, int num,
 
                /* Work out the disk rotation on this stripe-set */
                rot = stripe_nr % map->num_stripes;
-               stripe_nr /= map->num_stripes;
                /* calculate which stripe this data locates */
                rot += i;
                stripe_index = rot % map->num_stripes;