applied two of the 3 chunks in #6907, and a similar one

(replace nested 'if' with '&&')
I cannot make sense of the first chunk of the proposed patch,
i think the original is correct.



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@20225 65c4cc65-6c06-0410-ace0-fbb531ad65f3