s390/tty3270: ignore NUL characters
With 'TERM=vt220' zsh is sending several NUL characters with the prompt to the tty. Both xterm and the linux drm console seem to ignore them. Ignore them in tty3270 as well. Signed-off-by:Sven Schnelle <svens@linux.ibm.com> Acked-by:
Heiko Carstens <hca@linux.ibm.com> Tested-by:
Niklas Schnelle <schnelle@linux.ibm.com> Signed-off-by:
Heiko Carstens <hca@linux.ibm.com>
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