use PTP_OC_CANON_EOS_GetPartialObject instead of PTP_OC_CANON_EOS_GetPartialObjectEx, we seem not using it correctly
use PTP_OC_CANON_EOS_GetPartialObject instead of PTP_OC_CANON_EOS_GetPartialObjectEx,
we seem not using it correctly

remove init_ptp_fs, not used for a long time

gphoto/libgphoto2,gphoto/libgphoto2,gphoto/libgphoto2,gphoto/libgphoto2,gphoto/libgphoto2,gphoto/libgphoto2