btrfs: do not test for free space inode during NOCOW check against file extent

When checking if we can do a NOCOW write against a range covered by a file
extent item, we do a quick a check to determine if the inode's root was
snapshotted in a generation older than the generation of the file extent
item or not. This is to quickly determine if the extent is likely shared
and avoid the expensive check for cross references (this was added in
commit 78d4295b1eeed4 ("btrfs: lift some btrfs_cross_ref_exist checks in
nocow path").

We restrict that check to the case where the inode is not a free space
inode (since commit 27a7ff554e8d34 ("btrfs: skip file_extent generation
check for free_space_inode in run_delalloc_nocow")). That is because when
we had the inode cache feature, inode caches were backed by a free space
inode that belonged to the inode's root.

However we don't have support for the inode cache feature since kernel
5.11, so we don't need this check anymore since free space inodes are
now always related to free space caches, which are always associated to
the root tree (which can't be snapshotted, and its last_snapshot field
is always 0).

So remove that condition.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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