generic/079: use _require_test_program

use _require_test_program helper and specify both +i and +a
to _required_chattr, because test sets them both.

Also remove unneeded _scratch_unmount from _cleanup.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>

tests/generic/079

@@ -37,7 +37,6 @@ _cleanup()
     cd /
     echo "*** cleaning up"
     $timmutable -r $SCRATCH_MNT/$seq
-    _scratch_unmount
 }
 
 # get standard environment, filters and checks
@@ -48,11 +47,10 @@ _cleanup()
 _supported_fs generic
 _supported_os Linux
 
-_require_chattr i
+_require_chattr ia
+_require_test_program "t_immutable"
 _require_scratch
 
-[ -x $timmutable ] || _notrun "t_immutable was not built for this platform"
-
 # real QA test starts here
 _scratch_mkfs >/dev/null 2>&1 || _fail "mkfs failed"
 _scratch_mount || _fail "mount failed"