introduction SCCP_LIST_FIND function

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5339 43c1dc8c-776e-4df2-8ef1-6e829299be21
use SCCP_LIST_FIND function in sccp_device_find_byid

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5340 43c1dc8c-776e-4df2-8ef1-6e829299be21
Small cleanup of sccp_line_find_byname

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5341 43c1dc8c-776e-4df2-8ef1-6e829299be21
use SCCP_LIST_FIND function in sccp_channel.c

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5342 43c1dc8c-776e-4df2-8ef1-6e829299be21
Removed redundant variable update (var)=(var) when not using retain in SCCP_LIST_FIND

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5343 43c1dc8c-776e-4df2-8ef1-6e829299be21