Terminate version string

This cl doesn't directly solve b/6750185, but it's a potential bug
if string is not terminated correctly

BUG=
TEST=vie_auto_test
Review URL: https://webrtc-codereview.appspot.com/674009

git-svn-id: http://webrtc.googlecode.com/svn/trunk@2515 4adac7df-926f-26a2-2b94-8c16560cd09d

src/video_engine/vie_base_impl.cc

@@ -409,6 +409,7 @@ int ViEBaseImpl::GetVersion(char version[1024]) {
   int version_length = version_stream.tellp();
   assert(version_length < 1024);
   memcpy(version, version_stream.str().c_str(), version_length);
+  version[version_length] = '\0';
 
   WEBRTC_TRACE(kTraceStateInfo, kTraceVideo,
                ViEId(shared_data_.instance_id()), "GetVersion() => %s",