Retrieve exit status from pclose() correctly

src/bogofilter-smtpd.cpp

@@ -61,7 +61,8 @@ void on_data_line(protocol::protocol_t& protocol, protocol::message_t message) {
             for(string& line : session.message.body) {
                 fprintf(f, "%s\n", line);
             }
-            session.status = pclose(f);
+            int status = pclose(f);
+            session.status = WEXITSTATUS(status);
 
             return;
         }