Added refcount force release (temporary function)

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5317 43c1dc8c-776e-4df2-8ef1-6e829299be21
Fix segfault during 'sccp restart SEP...', maybe pthread_cancel should be removed completely at this location.

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5318 43c1dc8c-776e-4df2-8ef1-6e829299be21