[PATCH -next] btrfs: remove set but not used variable 'fs_devices'

[YueHaibing]

Fixes gcc '-Wunused-but-set-variable' warning:

fs/btrfs/volumes.c: In function 'btrfs_grow_device':
fs/btrfs/volumes.c:2824:27: warning:
 variable 'fs_devices' set but not used [-Wunused-but-set-variable]

It's not used after 6f32a50a232b ("btrfs: combine device update operations
during transaction commit")

Signed-off-by: YueHaibing <yuehaib...@huawei.com>
---
 fs/btrfs/volumes.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index afafc92e70e9..605230482009 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -2821,7 +2821,6 @@ int btrfs_grow_device(struct btrfs_trans_handle *trans,
 {
        struct btrfs_fs_info *fs_info = device->fs_info;
        struct btrfs_super_block *super_copy = fs_info->super_copy;
-       struct btrfs_fs_devices *fs_devices;
        u64 old_total;
        u64 diff;
 
@@ -2840,8 +2839,6 @@ int btrfs_grow_device(struct btrfs_trans_handle *trans,
                return -EINVAL;
        }
 
-       fs_devices = fs_info->fs_devices;
-
        btrfs_set_super_total_bytes(super_copy,
                        round_down(old_total + diff, fs_info->sectorsize));
        device->fs_devices->total_rw_bytes += diff;