Fix initial call to svcraw_create

gssrpc raw services could not work because svcraw_create did not set
svcraw_private after allocating memory for it.

[ghudson@mit.edu: commit message, patch splitting]

(cherry picked from commit 5e3bf4ac6cb02601c5f10c5b2804fd5028c80119)

ticket: 7582 (new)
subject: Minor pointer management patches
Fix various result checks

Correct three cases where the wrong expression was checked to see if
an allocation function returned null.

[ghudson@mit.edu: commit message, patch splitting]
[tlyu@mit.edu: omit inapplicable lib/kadm/srv/svr_principal.c change]

(back ported from commit a9ee4a040eeacab1d410ff9e4c862484b531c401)

ticket: 7582
version_fixed: 1.10.4
status: resolved