janitor cleanup. No functional change.
1). ast_dsp_call_progress: use 'short samp' instead of s[x] inside loop.
apply same casting as other _init, dsp->energy = (int32_t) samp * (int32_t) samp
2). ast_dtmf_detect_init: move repeated setting of s->energy to outside of loop.
do goertzel_init loop first before setting s->lasthit and s->current_hit, consistant with ast_dsp_digitreset()
3). ast_mf_detect_init:
do goertzel_init loop first before setting s->hits[] and s->current_hit, consistant with ast_dsp_digitreset()
4). Don't chain init different variables, as the type may change
Review https://reviewboard.asterisk.org/r/2107/
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@373275 65c4cc65-6c06-0410-ace0-fbb531ad65f3
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