[EchoServer] fix echo function

The break was not in the right scope and thus exiting the echo loop
immediately in the first iteration.

apps/EchoServer.cpp

@@ -58,8 +58,8 @@ auto main(int argc, char* argv[]) -> int {
 				if (bytes_recv < 0) {
 					LOGE("server read failed:" << strerror(errno));
 				}
+				break;
 			}
-			break;
 
 			if (unlikely(bytes_recv == 5 && strncmp("quit\n", buf, bytes_recv) == 0)) {
 				quit = true;