SocketsTest: Fix printing of non-nul-terminated string

Change-Id: I33d0ddf851d84b81ab5252e3755422170cee54ee
Fixes: Coverity CID#149363

CommonLibs/SocketsTest.cpp

@@ -61,7 +61,8 @@ void *testReaderUnix(void *)
 	readSocket.nonblocking();
 	int rc = 0;
 	while (rc<gNumToSend) {
-		char buf[MAX_UDP_LENGTH];
+		char buf[MAX_UDP_LENGTH+1];
+		buf[MAX_UDP_LENGTH] =  '\0';
 		int count = readSocket.read(buf, MAX_UDP_LENGTH);
 		if (count>0) {
 			COUT("read: " << buf);