Don't fail when running the Debian init script directly (as one would normally do).

readlink apparently returns 1 when the arg isn't a symlink, which caused the script to exit.

(closes issue #17910)
Reported by: wurstsalat


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@287195 65c4cc65-6c06-0410-ace0-fbb531ad65f3

contrib/init.d/rc.debian.asterisk

@@ -54,7 +54,7 @@ fi
 . /lib/lsb/init-functions
 
 # Allow configuration overrides in /etc/default/asterisk
-CONFIG0=`readlink $0`
+CONFIG0=`readlink $0 || :` # readlink returns 1 when something isn't a symlink
 if [ "$CONFIG0" = "" ]; then
 	CONFIGFILE=/etc/default/`basename $0`
 else