nanobsd: Fix the fix to a typo

Submitted by: jlduran@gmail.com
Reviewed by: imp, glebius, emaste
PR: 275691
Differential Revision: https://reviews.freebsd.org/D43035
Fixes: d8c70d6dfb65218dd3272b34512083621d3ed46d

(cherry picked from commit 330089470f56d502c629352b85e11522691e3368)