iscsi class: fix get_host_stats return code when not supported
When the get_host_stats call was not supported we were returing EINVAL. This has us return ENOSYS, because for software iscsi drivers where there is no host it is ok to not have this callout. Signed-off-by: NMike Christie <michaelc@cs.wisc.edu> Acked-by: NVikas Chaudhary <vikas.chaudhary@qlogic.com> Reviewed-by: NHannes Reinecke <hare@suse.de> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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