Oops, fixed insertion sort error in the fix for an insertion sort error.
Oops, fixed insertion sort error in the fix for an insertion sort error.

While here, begin fixing dependencies of <sys/mount.h> on normal namespace
pollution (__BSD_VISIBLE) by not using u_int in the prototype for nmount(2),
although it is used in the man page.

While there, begin cleaning up another set of prototypes:
- use u_int in the prototype for the kernel part of nmount().
- consistently don't use parameter names in prototypes in the
  "exported vnode operations" set of prototypes, although style(9) says to
  use names in the kernel.

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