res_pjsip: Fix for Doxygen.

ASTERISK-29747

Change-Id: Ic7a1e9453f805a6264fe86c96b7d18b87b376084

res/res_pjsip/config_global.c

@@ -564,8 +564,6 @@ static int overload_trigger_to_str(const void *obj, const intptr_t *args, char *
  * \param sorcery Instance being observed.
  * \param object_type Name of object being observed.
  * \param reloaded Non-zero if the object is being reloaded.
- *
- * \return Nothing
  */
 static void global_loaded_observer(const char *name, const struct ast_sorcery *sorcery, const char *object_type, int reloaded)
 {

res/res_pjsip/config_transport.c

@@ -1197,6 +1197,7 @@ static pj_ssl_cipher cipher_name_to_id(const char *name)
 }
 #endif
 
+#if defined(PJ_HAS_SSL_SOCK) && PJ_HAS_SSL_SOCK != 0
 /*!
  * \internal
  * \brief Add a new cipher to the transport's cipher list array.
@@ -1207,7 +1208,6 @@ static pj_ssl_cipher cipher_name_to_id(const char *name)
  * \retval 0 on success.
  * \retval -1 on error.
  */
-#if defined(PJ_HAS_SSL_SOCK) && PJ_HAS_SSL_SOCK != 0
 static int transport_cipher_add(struct ast_sip_transport_state *state, const char *name)
 {
 	pj_ssl_cipher cipher;

res/res_pjsip/include/res_pjsip_private.h

@@ -178,16 +178,12 @@ int ast_sip_destroy_sorcery_global(void);
 /*!
  * \internal
  * \brief Initialize global headers support
- *
- * \return Nothing
  */
 void ast_sip_initialize_global_headers(void);
 
 /*!
  * \internal
  * \brief Destroy global headers support
- *
- * \return Nothing
  */
 void ast_sip_destroy_global_headers(void);
 
@@ -383,7 +379,7 @@ int ast_sip_will_uri_survive_restart(pjsip_sip_uri *uri, struct ast_sip_endpoint
  * for that period of time, it also prevents issues if the transport
  * disconnects while we're still trying to process a response.
  *  (Attack mitigation)
- * 3.  If enabled by global/keep_alive_interval, it sends '\r\n'
+ * 3.  If enabled by global/keep_alive_interval, it sends '\\r\\n'
  * keepalives on reliable transports at the interval specified.
  *
  * \retval -1 Failure

res/res_pjsip/pjsip_distributor.c

@@ -1219,8 +1219,6 @@ static struct ast_sorcery_observer global_observer = {
  * \internal
  * \brief Shutdown the serializers in the distributor pool.
  * \since 13.10.0
- *
- * \return Nothing
  */
 static void distributor_pool_shutdown(void)
 {

res/res_pjsip/pjsip_transport_events.c

@@ -121,8 +121,6 @@ static void transport_monitor_dtor(void *vdoomed)
  *
  * \param transports Active transports container
  * \param transport Which transport to do callbacks for.
- *
- * \return Nothing
  */
 static void transport_state_do_reg_callbacks(struct ao2_container *transports, pjsip_transport *transport)
 {