res_musiconhold.c: Remove some unnecessary RAII_VAR() usage.

* Made the moh_register() define use useful parameter names.
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Merged revisions 409967 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@409970 f38db490-d61c-443f-a65b-d21fe96a405b
app_confbridge: Remove some noop code.
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Merged revisions 409976 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@409977 f38db490-d61c-443f-a65b-d21fe96a405b