staging/hfi1: Remove un-needed variable

There is no need to use a separate variable for a
return value and a label when returning right away
would do just as well.

Signed-off-by: Mitko Haralanov <mitko.haralanov@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>