btrfs: pass a bool to btrfs_block_rsv_migrate() at evict_refill_and_join()

The last argument of btrfs_block_rsv_migrate() is a boolean, but we are
passing an integer, with a value of 1, to it at evict_refill_and_join().
While this is not a bug, due to type conversion, it's a lot more clear to
simply pass the boolean true value instead. So just do that.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/inode.c

@@ -5268,7 +5268,7 @@ static struct btrfs_trans_handle *evict_refill_and_join(struct btrfs_root *root,
 		trans->block_rsv = &fs_info->trans_block_rsv;
 		trans->bytes_reserved = delayed_refs_extra;
 		btrfs_block_rsv_migrate(rsv, trans->block_rsv,
-					delayed_refs_extra, 1);
+					delayed_refs_extra, true);
 	}
 	return trans;
 }