man: use more markup in daemon(7)
sd-event: check the value of received signal

Appease coverity report #1237775.

Also rename ss to n, to make it visually different from ss.
core/namespace: remove invalid check

root cannot be NULL here, because it was allocated with alloca.

CID #1237769.
core/namespace: remove invalid check

dir cannot be NULL here, because it was allocated with alloca.

CID #1237768.
sd-bus: split out cleanup into separate function

m is always non-null at this point. This function is too long anyway.
fstab-generator: Small cleanup