Fix memleak and silence Coverity defects

Some of these are not real defects, because we are guaranteed to have valid
context in some functions, and checks are not necessary.
I added the checks anyway in order to silence Coverity on these issues.

One meleak on error condition was fixed in
daemons/ipa-kdb/ipa_kdb_pwdpolicy.c

Silence errors in ipa-client/ipa-getkeytab.c, the code looks wrong, but it is
actually fine as we count before hand so we never actually use the wrong value
that is computed on the last pass when p == 0

Fixes: https://fedorahosted.org/freeipa/ticket/2488

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