HBSD USERLAND: try a better compile error fix after reallocarray import

github-issue: #70
Signed-off-by: Oliver Pinter <oliver.pntr@gmail.com>
CC: David Carlier <david.carlier@hardenedbsd.org>
(cherry picked from commit 97040b658a64c972b0d82aeabf62c3770d54666a)
Signed-off-by: Oliver Pinter <oliver.pinter@hardenedbsd.org>