opencv calibration cpp with video files (Bug #392)

when running calibration with a video file i get the following error:

../opencv_new/opencv_build/bin/calibration -w 6 -h 8 wide.dv
[[OpenCV]] Error: Parsing error (wide.dv(0): Too long string or a last string w/o newline) in icvXMLSkipSpaces, file /home/ethan/opencv_new/opencv/modules/core/src/persistence.cpp, line 1728
terminate called after throwing an instance of 'cv::Exception'
  what():  /home/ethan/opencv_new/opencv/modules/core/src/persistence.cpp:1728: error: (-212) wide.dv(0): Too long string or a last string w/o newline in function icvXMLSkipSpaces

Here is svn info on the calibration sample

Path: samples/cpp/calibration.cpp
Name: calibration.cpp
URL: https://code.ros.org/svn/opencv/trunk/opencv/samples/cpp/calibration.cpp
Repository Root: https://code.ros.org/svn/opencv
Repository UUID: 73c94f0f-984f-4a5f-82bc-2d8db8d8ee08
Revision: 3239
Node Kind: file
Schedule: normal
Last Changed Author: vp153
Last Changed Rev: 3217
Last Changed Date: 2010-06-13 15:08:24 -0400 (Sun, 13 Jun 2010)
Text Last Updated: 2010-06-20 21:16:44 -0400 (Sun, 20 Jun 2010)
Checksum: a6ad05662b913e3fcab5396f4866d66f

attached is my version that allows video files using the flag -V.