* sierra.c (camera_init): Pass NULL as context, because we will
ignore those error messages and are just probing for the level of
support for filenames or folders.
git-svn-id: https://svn.code.sf.net/p/gphoto/code/trunk/libgphoto2@4077 67ed7778-7388-44ab-90cf-0a291f65f57c