did not have a return value and was breaking on windows build

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@5638 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/switch_cpp.cpp

@@ -165,6 +165,7 @@ int CoreSession::collectDigits(int timeout) {
     begin_allow_threads();
 	switch_ivr_collect_digits_callback(session, ap, timeout);
     end_allow_threads();
+    return SWITCH_STATUS_SUCCESS;
 } 
 
 int CoreSession::getDigits(char *dtmf_buf,