Fix warnings (#1046)

Clang emitted some easy to fix warnings.

src/apps/common/apputils.c

@@ -665,7 +665,7 @@ int get_socket_mtu(evutil_socket_t fd, int family, int verbose)
 
 //////////////////// socket error handle ////////////////////
 
-int handle_socket_error() {
+int handle_socket_error(void) {
   switch (errno) {
   case EINTR:
     /* Interrupted system call.
@@ -969,7 +969,7 @@ char *base64_encode(const unsigned char *data,
     return encoded_data;
 }
 
-void build_base64_decoding_table() {
+void build_base64_decoding_table(void) {
 
     decoding_table = (char*)malloc(256);
     memset(decoding_table, 0, 256);

src/apps/relay/dbdrivers/dbdriver.c

@@ -67,7 +67,7 @@ persistent_users_db_t * get_persistent_users_db(void) {
 	return &(turn_params.default_users_db.persistent_users_db);
 }
 
-const turn_dbdriver_t * get_dbdriver()
+const turn_dbdriver_t * get_dbdriver(void)
 {
 	if (turn_params.default_users_db.userdb_type == TURN_USERDB_TYPE_UNKNOWN)
 		return NULL;

src/apps/relay/http_server.c

@@ -77,7 +77,7 @@ void handle_http_echo(ioa_socket_handle s) {
 	write_http_echo(s);
 }
 
-const char* get_http_date_header()
+const char* get_http_date_header(void)
 {
 	static char buffer_date[256];
 	static char buffer_header[1025];

src/apps/relay/libtelnet.c

@@ -744,7 +744,7 @@ static int _mssp_telnet(telnet_t *telnet, char* buffer, size_t size) {
 /* parse ZMP command subnegotiation buffers */
 static int _zmp_telnet(telnet_t *telnet, const char* buffer, size_t size) {
 	telnet_event_t ev;
-	char **argv;
+	const char **argv;
 	const char *c;
 	size_t i, argc;
 
@@ -760,7 +760,7 @@ static int _zmp_telnet(telnet_t *telnet, const char* buffer, size_t size) {
 		c += strlen(c) + 1;
 
 	/* allocate argument array, bail on error */
-	if ((argv = (char **)calloc(argc, sizeof(char *))) == 0) {
+	if ((argv = (const char **)calloc(argc, sizeof(const char *))) == 0) {
 		_error(telnet, __LINE__, __func__, TELNET_ENOMEM, 0,
 				"calloc() failed: %s", strerror(errno));
 		return 0;
@@ -768,13 +768,13 @@ static int _zmp_telnet(telnet_t *telnet, const char* buffer, size_t size) {
 
 	/* populate argument array */
 	for (i = 0, c = buffer; i != argc; ++i) {
-		argv[i] = (char *)c;
+		argv[i] = c;
 		c += strlen(c) + 1;
 	}
 
 	/* invoke event with our arguments */
 	ev.type = TELNET_EV_ZMP;
-	ev.zmp.argv = (const char**)argv;
+	ev.zmp.argv = argv;
 	ev.zmp.argc = argc;
 	telnet->eh(telnet, &ev, telnet->ud);
 

src/apps/relay/userdb.c

@@ -73,7 +73,7 @@ void update_o_to_realm(ur_string_map * o_to_realm_new) {
   TURN_MUTEX_UNLOCK(&o_to_realm_mutex);
 }
 
-void create_default_realm()
+void create_default_realm(void)
 {
 	if(default_realm_params_ptr) {
 		return;

src/apps/uclient/uclient.c

@@ -1699,7 +1699,7 @@ int check_integrity(app_ur_conn_info *clnet_info, stun_buffer *message)
 	return 0;
 }
 
-SOCKET_TYPE get_socket_type()
+SOCKET_TYPE get_socket_type(void)
 {
 	if(use_sctp) {
 		if(use_secure) {

src/server/ns_turn_maps.c

@@ -58,7 +58,7 @@ static int ur_map_init(ur_map* map) {
 
 #define ur_map_valid(map) ((map) && ((map)->h) && ((map)->magic==MAGIC_HASH))
 
-ur_map* ur_map_create() {
+ur_map* ur_map_create(void) {
   ur_map *map=(ur_map*)malloc(sizeof(ur_map));
   if(ur_map_init(map)<0) {
     free(map);