Make sure to set owner_line, ownder_func, and owner_file in ast_calloc_with_stringfields.

Make sure to set owner_line, ownder_func, and owner_file in ast_calloc_with_stringfields.

Asterisk would crash on startup if MALLOC_DEBUG were set in menuselect. This is because
the manager action UpdateConfig had to resize its string field allocation to set the
description. When the resize occurred, ast_copy_string would crash because we were
attempting to copy a string from a NULL pointer. Setting the strings initially makes
the code much less crashy.

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@240420 65c4cc65-6c06-0410-ace0-fbb531ad65f3