btrfs: convert several int parameters to bool

We're almost done cleaning misused int/bool parameters. Convert a bunch
of them, found by manual grepping.  Note that btrfs_sync_fs() needs an
int as it's mandated by the struct super_operations prototype.

Reviewed-by: Boris Burkov <boris@bur.io>
Signed-off-by: David Sterba <dsterba@suse.com>