btrfs: rename __btrfs_dev_replace_cancel()

Remove __ which is for the special functions.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 9082b06f..c5a5591 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -4429,7 +4429,7 @@ static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info,
 		ret = 0;
 		break;
 	case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
-		p->result = __btrfs_dev_replace_cancel(fs_info);
+		p->result = btrfs_dev_replace_cancel(fs_info);
 		ret = 0;
 		break;
 	default: