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sfxge(4): fix PreFAST warnings because of unused return

Description

sfxge(4): fix PreFAST warnings because of unused return

Submitted by: Martin Harvey <mharvey at solarflare.com>
Sponsored by: Solarflare Communications, Inc.
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D18244

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