Fix newPacketSize when it equals SCCP_MAX_PACKET (https://sourceforge.net/p/chan-sccp-b/bugs/181)

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4583 43c1dc8c-776e-4df2-8ef1-6e829299be21
Fix number of buttons on 8941 (https://sourceforge.net/p/chan-sccp-b/bugs/181)

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4584 43c1dc8c-776e-4df2-8ef1-6e829299be21