Remove some redundant logic from wait_for_answer. This also let's us get rid of one of

those XXX comments from the code.

The redundancy occurs because the 'single' flag implies that the 'r' and 'm' flags are
not set, so there's no need to explicitly check them again.



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@107530 65c4cc65-6c06-0410-ace0-fbb531ad65f3