Fix reloading sccp.conf when macaddress has changed, cause by deadlock on SCCP_RWLIST_WRLOCK(&GLOB(devices)) (Fix bug #210, reported by Dmitry).

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5044 43c1dc8c-776e-4df2-8ef1-6e829299be21