More safe strncat usage.

cl_dll/MOTD.cpp

@@ -134,7 +134,8 @@ int CHudMOTD::MsgFunc_MOTD( const char *pszName, int iSize, void *pbuf )
 	BEGIN_READ( pbuf, iSize );
 
 	int is_finished = READ_BYTE();
-	strncat( m_szMOTD, READ_STRING(), sizeof(m_szMOTD) - 1 );
+	strncat( m_szMOTD, READ_STRING(), sizeof(m_szMOTD) - strlen(m_szMOTD) - 1 );
+	m_szMOTD[sizeof(m_szMOTD) - 1] = '\0';
 
 	if( is_finished )
 	{

cl_dll/death.cpp

@@ -173,6 +173,7 @@ int CHudDeathNotice::MsgFunc_DeathMsg( const char *pszName, int iSize, void *pbu
 	char killedwith[32];
 	strcpy( killedwith, "d_" );
 	strncat( killedwith, READ_STRING(), sizeof(killedwith) - strlen(killedwith) - 1 );
+	killedwith[sizeof(killedwith) - 1] = '\0';
 
 #if USE_VGUI
 	if (gViewPort)