EFSYS_PROBE1 takes one typed value (in addition to the probe name),
whereas EFSYS_PROBE has just the probe name.
Which to use is determined by the probe name – “fail1” probes are
expected to include the function result.
Submitted by: Mark Spender <mspender at solarflare.com>
Sponsored by: Solarflare Communications, Inc.
MFC after: 1 week