Fix rwlist reentrancy locking issue when using realtimedb (Reported by Niklas)

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5028 43c1dc8c-776e-4df2-8ef1-6e829299be21
Fix rwlist reentrancy locking issue when using realtimedb (Reported by Niklas)

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5029 43c1dc8c-776e-4df2-8ef1-6e829299be21