replace: Remove unused item returned by FAILED()

The (return) value of FAILED() is a constant 1.  However, it is never
used, so the compiler complains when run with -Wall:

  lib/replace/test/os2_delete.c: In function ‘cleanup’:
  lib/replace/test/os2_delete.c:39:163: warning: right-hand operand of comma expression has no effect [-Wunused-value]
   FAILED("system");

So just get remove the ", 1" since it is the bit that does nothing and
is never used.

Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>

Autobuild-User(master): Amitay Isaacs <amitay@samba.org>
Autobuild-Date(master): Wed Aug 20 16:54:31 CEST 2014 on sn-devel-104