nvmf: Fix null ptr reference
Approved by: so
Security: FreeBSD-SA-26:07.nvmf
Security: CVE-2026-4652
Reported by: Nikolay Denev <ndenev@gmail.com>
Reviewed by: imp, jhb
Differential Revision: https://reviews.freebsd.org/D55863
(cherry picked from commit 09c5bb35425bc70573c007e7f7e82be286677a87)
(cherry picked from commit b1d32521747f42aea751d2742d26eb53e81952c6)