TTY: isdn, use tty_port_block_til_ready helper
This removes a bunch of duplicated code which does the same as tty_port_block_til_ready does. Signed-off-by: NJiri Slaby <jslaby@suse.cz> Cc: Karsten Keil <isdn@linux-pingi.de> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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