btrfs: tracepoints: use btrfs_root_id() to get the id of a root

btrfs: tracepoints: use btrfs_root_id() to get the id of a root

[ Upstream commit 0f987c099d22c3b8c7d94fd13f957792e46f79c9 ]

Instead of open coding btrfs_root_id() to get the ID of a root, use the
helper in the trace points, which also makes the code less verbose.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Stable-dep-of: f157dd661339 ("btrfs: fix NULL dereference on root when tracing inode eviction")
Signed-off-by: Sasha Levin <sashal@kernel.org>