btrfs: use PTR_ERR_OR_ZERO() to simplify code inbtrfs_control_ioctl()

Use the standard error pointer macro to simplify the code.

Reviewed-by: Daniel Vacek <neelx@suse.com>
Signed-off-by: Xichao Zhao <zhao.xichao@vivo.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index b06b8f325537811cbec16ce23b3212f1a0c4a7c1..ee2418bb2efd0b4c8a4227d5c0c3a923615acbde 100644 (file)
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -2274,10 +2274,7 @@ static long btrfs_control_ioctl(struct file *file, unsigned int cmd,
                device = btrfs_scan_one_device(vol->name, false);
                if (IS_ERR_OR_NULL(device)) {
                        mutex_unlock(&uuid_mutex);
-                       if (IS_ERR(device))
-                               ret = PTR_ERR(device);
-                       else
-                               ret = 0;
+                       ret = PTR_ERR_OR_ZERO(device);
                        break;
                }
                ret = !(device->fs_devices->num_devices ==