staging/rdma/hfi1: Further clean up hfi1_ioctl parameter checks

Final clean up of the if/then/else clause for the parameter checks of
hfi1_ioctl

Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>