wal: clean up code format

Signed-off-by: Gyuho Lee <gyuhox@gmail.com>

wal/repair_test.go

@@ -153,10 +153,7 @@ func TestRepairWriteTearLast(t *testing.T) {
 		if terr := f.Truncate(1024); terr != nil {
 			return terr
 		}
-		if terr := f.Truncate(offset); terr != nil {
-			return terr
-		}
-		return nil
+		return f.Truncate(offset)
 	}
 	testRepair(t, makeEnts(50), corruptf, 40)
 }

wal/wal_test.go

@@ -273,7 +273,7 @@ func TestSaveWithCut(t *testing.T) {
 	const EntrySize int = 500
 	SegmentSizeBytes = 2 * 1024
 	defer func() { SegmentSizeBytes = restoreLater }()
-	var index uint64 = 0
+	index := uint64(0)
 	for totalSize := 0; totalSize < int(SegmentSizeBytes); totalSize += EntrySize {
 		ents := []raftpb.Entry{{Index: index, Term: 1, Data: bigData}}
 		if err = w.Save(state, ents); err != nil {