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When compiling ZFS in user space gcc-4.6.0 correctly identifies
the variable 'value' as being set but never used.  This generates a
warning and a build failure when using --enable-debug.  Once again
this is correct but I'm reluctant to remove 'value' because we are
breaking the string in to name/value pairs.  While it is not used
now there's a good chance it will be soon and I'd rather not have
to reinvent this.  To suppress the warning with just as a VERIFY().
This was observed under Fedora 15.

  cmd/mount_zfs/mount_zfs.c: In function ‘parse_option’:
  cmd/mount_zfs/mount_zfs.c:112:21: error: variable ‘value’ set but not
  used [-Werror=unused-but-set-variable]