MFC 279951:

MFC 279951:
Simplify string mangling in ifmaybeload().
- Use strlcpy() instead of strcpy().
- Use strlcat() instead of a strlcpy() with a magic number subtracted
  from the length.
- Replace strncmp(..., strlen(foo) + 1) with strcmp(...).

git-svn-id: svn://svn.freebsd.org/base/stable/10@281326 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f