[LTP] [PATCH v4] Use real FS block size in fallocate05

[Cyril Hrubis]

Hi!
Pushed with minor changes, thanks.

I've added ack from Jan that was for v3 since the changes were mostly
cosmetic.

The changes I've done are:

* We do have SAFE_MALLOC() so I replaced the malloc() + tst_brk()

* There is no point in closing fd before tst_brk() because cleanup() is
  called before test exit, which will close the fd anyways

-- 
Cyril Hrubis
chrubis@suse.cz