gofmt simplify

connection_test.go

@@ -130,7 +130,7 @@ func BenchmarkConnectionMainReadLoop(b *testing.B) {
 			// The chunk must be written to storage everytime, to ensure the
 			// writeSem is unlocked.
 			t.pieces[0].dirtyChunks.Clear()
-			cn.validReceiveChunks = map[request]struct{}{newRequestFromMessage(&msg): struct{}{}}
+			cn.validReceiveChunks = map[request]struct{}{newRequestFromMessage(&msg): {}}
 			cl.unlock()
 			n, err := w.Write(wb)
 			require.NoError(b, err)

metainfo/metainfo.go

@@ -81,7 +81,7 @@ func (mi *MetaInfo) UpvertedAnnounceList() AnnounceList {
 		return mi.AnnounceList
 	}
 	if mi.Announce != "" {
-		return [][]string{[]string{mi.Announce}}
+		return [][]string{{mi.Announce}}
 	}
 	return nil
 }