ast_exists_extension() does not return an ast_device_state, so change this

function to explicitly check for the int return value.  Also, make a few
other minor changes such as removing a variable.


git-svn-id: http://svn.digium.com/svn/asterisk/trunk@73886 f38db490-d61c-443f-a65b-d21fe96a405b

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