qcow: add return to get_refcount() to silence compiler
qcow: add return to get_refcount() to silence compiler

Signed-off-by: David Disseldorp <589a549dc9f982d9f46aeeb82a09ab6d87ccf1d8@suse.de>

lxbsz/tcmu-runner,agrover/tcmu-runner,superlibj/tcmu-runner,open-iscsi/tcmu-runner,open-iscsi/tcmu-runner,yasker/tcmu-runner,liuy/tcmu-runner,JefferyHu/tcmu-runner