initramfs-framework: fix boothang when console=null
If console=null systemd-udevd throws an assertion which prevents the
system from booting. This patch redirects stdin, stdout and stderr to
/dev/null in case that the console can't be opened so that udevd still
boots.
A systemd issue was reported here. However, they will not fix this
specific use-case:
https://github.com/systemd/systemd/issues/13332
Signed-off-by: Stefan Eichenberger <stefan.eichenberger@toradex.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
