openposix/.../aio_fsync/2-1,3-1: Add "Test PASSED"

Make the tests to print "Test PASSED" when the test has passed.

Signed-off-by: Cyril Hrubis <chrubis@suse.cz>
openposix/.../aio_fsync/5-1.c: Fixes.

* Don't use ret variable to store return value from aio_error() as this
  overwrites the value that should be returned (coincidentally both
  PTS_PASS and return from aio_error() when I/O has finised are zero).

* Print "Test PASSED" when test has passed.

Signed-off-by: Cyril Hrubis <chrubis@suse.cz>