IB/hfi1: Fix misspelling in comment

Checkpatch flagged a misspelled word. Fix it.

Fixes: 8764522e ("staging/rdma/hfi1: Unexpected link up pkey values are not an error")
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>