12724 update smatch to 0.6.1-rc1-il-5

@@ -72,11 +72,11 @@
                 get_real_base_type(sym) == &void_ctype))
                 return;
 
         stmt = last_ptr_list((struct ptr_list *)big_statement_stack);
 
-        if (stmt->type == STMT_EXPRESSION && stmt->expression == expr)
+        if (stmt && stmt->type == STMT_EXPRESSION && stmt->expression == expr)
                 sm_error("unchecked function return '%s'", expr_to_str(expr->fn));
 }
 
 void check_all_func_returns(int id)
 {