specs: fix a bug in lstat.st_blocks example.
specs: fix a bug in lstat.st_blocks example.

* specs/posix_sys_stat_spec.yaml (lstat): Don't expect number
of disk blocks used by a file to equal the number used by the
directory that file is in!

Signed-off-by: Gary V. Vaughan <f9023000f29773649f3850298becb9544b5fd6a9@gnu.org>

rrthomas/luaposix,jimmyharris/luaposix,luaposix/luaposix,rrthomas/luaposix,jimmyharris/luaposix,zevv/luaposix,zevv/luaposix,snegovick/luaposix,ardje/luaposix,ardje/luaposix,snegovick/luaposix