[linux-lvm] Bug in error code for lvm_vg_open()

[ben]

If a volume group is clustered and the cluster is not running, lvm_vg_open() 
fails and prints a message about skipping the group. However, lvm_errno() and 
lvm_errmsg() are not updated. It would be really useful (to me) if the error 
number was set to something specific to the clustering issue rather than a 
generic error. 

Also, where are the errors defined or are only the standard system ones being 
used?

Thank you and keep up the good work.