Explicitly close the TLS connection

Just to be nice.

chat.c

@@ -269,5 +269,6 @@ int main(int argc, char *argv[]) {
 	};
 	handle(msg);
 
+	ircClose();
 	uiHide();
 }

chat.h

@@ -130,6 +130,7 @@ void ircRecv(void);
 void ircSend(const char *ptr, size_t len);
 void ircFormat(const char *format, ...)
 	__attribute__((format(printf, 1, 2)));
+void ircClose(void);
 
 extern struct Replies {
 	size_t join;

irc.c

@@ -273,3 +273,9 @@ void ircRecv(void) {
 	len -= line - buf;
 	memmove(buf, line, len);
 }
+
+void ircClose(void) {
+	int error = tls_close(client);
+	if (error) errx(EX_IOERR, "tls_close: %s", tls_error(client));
+	tls_free(client);
+}