#960: Added a Buffer Overflow Fix in INFO tags of RIFFVIDEO.CPP

git-svn-id: svn://dev.exiv2.org/svn@3264 b7c8b350-86e7-0310-a4b4-de8f6a8f16a3
#960: Fixed a small bug found by coverity scan results 

git-svn-id: svn://dev.exiv2.org/svn@3265 b7c8b350-86e7-0310-a4b4-de8f6a8f16a3