fixes https://github.com/openwrt/openwrt/issues/23745
upstream had bug bb_got_signal to be never cleared in noninteractive session, this fixes this while waiting for upstream merge.
the patch iself is written by Ian Cooper <iancooper@hotmail.com>
Signed-off-by: Seo Suchan <tjtncks@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/23787
Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>
24662e811e