staging/lustre: surround module_refcount with CONFIG_MODULE_UNLOAD
module_refcount() is not available when CONFIG_MODULE_UNLOAD is off. Reported-by: NStephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: NPeng Tao <tao.peng@emc.com> Signed-off-by: NAndreas Dilger <andreas.dilger@intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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