Fix warning of Coverity Static analysis, change H225ProtocolIdentifier

from value to pointer per functions that use this.

(close issue ASTERISK-19670)
Reported by: Matt Jordan
Patches:
  ASTERISK-19670.patch (License #5415)
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Merged revisions 365159 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 365160 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@365161 65c4cc65-6c06-0410-ace0-fbb531ad65f3