tty: rename and de-inline do_tty_write()

Make do_tty_write()'s name sound similar to iterate_tty_read(). They
both do similar things, so there is no reason for so distinct names. The
new name is therefore iterate_tty_write().

Drop the unnedeed inline modifier too. Let the compiler decide.

Signed-off-by: "Jiri Slaby (SUSE)" <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20230810091510.13006-23-jirislaby@kernel.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>