Address MISSING_BREAK static analysis reports some more.

This addresses core findings 4 and 6.

Moises Silva helped me by stating that a break could be
safely added to the case where it is added in chan_dahdi.c

In say.c, I have added a comment indicating that static analysis
complains but that it is currently unknown if this is correct.

This fixes all core findings of this type.

(closes issue ASTERISK-19662)
reported by Matthew Jordan
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Merged revisions 367027 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 367028 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@367029 65c4cc65-6c06-0410-ace0-fbb531ad65f3