xmalloc, xstrdup, and ENOMEM

[Alexey Mahotkin]

I'm looking into server.c and see a lot of places where the return value of
xmalloc() is actually checked for NULL.

Looking at subr.c I see that xmalloc() does error(1, ...) if malloc()
returned NULL.

Am I missing something or should we get rid of a lot of such code from
server.c (and other places probably)?

--alexm