Use strlcpy to guarantee NUL termination. Due to this, there is
no need for strncmp; simply use strcmp.
Reported by: Coverity
CID: 1412242
MFC after: 2 weeks
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D23159
This is based on DragonFly's implementation from about 2019-09-13. It
only contains the basic code and header information to identify the
disks.
Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D13369