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]

ticket: 7534
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]

ticket: 7534
target_version: 1.11.1
tags: pullup