staging/rdma/hfi1: cleanup messages on qsfp_read() failure

The ":" in "%s:" adds no value.

Reviewed-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Easwar Hariharan <easwar.hariharan@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>