zdtm: check an exit code of make

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm.sh

@@ -300,7 +300,7 @@ start_test()
 	}
 
 	if [ -z "$PIDNS" ]; then
-		make -C $tdir $tname.pid
+		make -C $tdir $tname.pid || return 1
 		PID=`cat $test.pid` || return 1
 	else
 		if [ -z "$ZDTM_ROOT" ]; then
@@ -309,7 +309,7 @@ start_test()
 			ZDTM_ROOT=`readlink -f $ZDTM_ROOT`
 			mount --bind . $ZDTM_ROOT || return 1
 		fi
-		make -C $tdir $tname
+		make -C $tdir $tname || return 1
 		construct_root $ZDTM_ROOT $tdir/$tname || return 1
 	(	export ZDTM_NEWNS=1
 		export ZDTM_PIDFILE=$TPID