Fix sccp_handle_keypad_button (Reported by Pavel)

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5499 43c1dc8c-776e-4df2-8ef1-6e829299be21
Fix sccp_handle_keypad_button (Reported by Pavel)

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5500 43c1dc8c-776e-4df2-8ef1-6e829299be21