That patch does
mkdir -p /lib/init/rw/sendsigs.omit.d/nbd-client
so it creates the intended destination of the pid file as a directory causing the next line to fail.
That patch does
mkdir -p /lib/init/ rw/sendsigs. omit.d/ nbd-client
so it creates the intended destination of the pid file as a directory causing the next line to fail.