chan_unistim.c, app_meetme: compiler warnings

Fixed a couple of compiler warnings (errors in 'dev-mode') given by gcc
version 4.8.1. The one in app_meetme involved the 'sizeof-pointer-memaccess'
(see: http://gcc.gnu.org/gcc-4.8/porting_to.html) warning. The one in
chan_unistim was issuing an array out of bounds message. Fixed both so
they would no longer issue warnings and can compile again in 'dev-mode'.

Review: https://reviewboard.asterisk.org/r/3098/


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/1.8@404742 f38db490-d61c-443f-a65b-d21fe96a405b
chan_dahdi: dahdi show channels slices PRI channel dnid on output

dahdi show channels output slices the callerid (which is dnid copied over on
PRI channels). If the channel naming structures look like:

 'DAHDI/i1/1408409XXXX-6'

then the output slices 1408409XXXX down to 1408409XXX. This patch just opens
it up to 15 chars so you can see the whole thing.

(closes issue ASTERISK-22918)
Reported by: outtolunc
Patches:
     svn_chan_dahdi.c.format12_15.diff.txt uploaded by outtolunc (license 5198)


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/1.8@404784 f38db490-d61c-443f-a65b-d21fe96a405b