fExitProc
void (*fExitProc)(void);
if (initProc == NULL || fExitProc == NULL) {
if (fExitProc) {
(*fExitProc)();
fExitProc = NULL;
get_image_symbol(fAddOnID, "exit_transport", B_SYMBOL_TYPE_TEXT, (void **) &fExitProc);