errcheck, instancetype: Remove pkg/instancetype from exclude_files
errcheck, instancetype: Remove pkg/instancetype from exclude_files

pkg/instancetype currently builds successfully without any errcheck
errors and so can be removed from exclude_files.

Signed-off-by: Lee Yarwood <48c413690cc1868fd4674765d19c7979f048b748@redhat.com>

kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt