tty: drop outdated comments about release_tty() locking
The current version of the TTY code unlocks the tty_struct(s) before release_tty() rather than after. Moreover, tty_unlock_pair() no longer exists. Thus, remove the outdated comments regarding tty_unlock_pair(). Signed-off-by: NEric Biggers <ebiggers@google.com> Link: https://lore.kernel.org/r/20200224073359.292795-1-ebiggers@kernel.orgSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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