fix warning abount comment inside comment

src/mod/applications/mod_mp4/mod_mp4.cpp

@@ -42,7 +42,7 @@ SWITCH_MODULE_DEFINITION(mod_mp4, mod_mp4_load, NULL, NULL);
 #define VID_BIT (1 << 31)
 #define VERSION 4201
 
-/*
+#ifdef MP4_RECORD
 struct file_header {
 	int32_t version;
 	char video_codec_name[32];
@@ -58,7 +58,7 @@ struct record_helper {
 	int fd;
 	int up;
 };
-*/
+#endif
 
 struct AVParams {
 	switch_core_session_t * session;
@@ -75,7 +75,7 @@ struct AVParams {
 
 static void *SWITCH_THREAD_FUNC record_video_thread(switch_thread_t *thread, void *obj)
 {
-/*
+#ifdef MP4_RECORD
 	record_helper *eh = reinterpret_cast<record_helper *>(obj);
 	switch_core_session_t *session = eh->session;
 	switch_channel_t *channel = switch_core_session_get_channel(session);
@@ -114,13 +114,13 @@ static void *SWITCH_THREAD_FUNC record_video_thread(switch_thread_t *thread, voi
 		switch_core_session_write_video_frame(session, read_frame, SWITCH_IO_FLAG_NONE, 0);
 	}
 	eh->up = 0;
-*/
+#endif
 	return NULL;
 }
 
 SWITCH_STANDARD_APP(record_mp4_function)
 {
-/*
+#ifdef MP4_RECORD
 	switch_status_t status;
 	switch_frame_t *read_frame;
 	switch_channel_t *channel = switch_core_session_get_channel(session);
@@ -163,7 +163,7 @@ SWITCH_STANDARD_APP(record_mp4_function)
 		switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_CRIT, "Error opening file %s\n", (char *) data);
 		return;
 	}
-**
+*/
 
 	MP4::Context ctx(reinterpret_cast<char*>(data), true);
 
@@ -258,7 +258,7 @@ SWITCH_STANDARD_APP(record_mp4_function)
 
 	switch_core_session_set_read_codec(session, NULL);
 	switch_core_codec_destroy(&codec);
-*/
+#endif
 }
 
 static void *SWITCH_THREAD_FUNC play_video_function(switch_thread_t *thread, void *obj)