hostfs: remove "will unlock" comment

hostfs: remove "will unlock" comment

A "will unlock" comment was added to hostfs in the following commit,
along with a spinlock:

Commit c33b41f97d079865036302d6d22551d1b1f2e897 ("hostfs: fix races in
dentry_name() and inode_name()").

But the spinlock was subsequently removed in the following commit:

Commit fe6b8b96f92a84f62411cbd2382b8eacb6ef61bf ("hostfs: simplify
locking").

Since the comment is no longer applicable, remove it.

Reported-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Nick Piggin <npiggin@kernel.dk>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>