refactor: simplify journal logs following, fix corrosion unit name

internal/journal/journal.go

@@ -52,18 +52,18 @@ func logs(ctx context.Context, unit string, opts api.ServiceLogsOptions) (io.Rea
 }
 
 // follow synchronously follows the io.Reader, writing each new journal entry to channel.
-func follow(ctx context.Context, reader io.Reader, outCh chan api.LogEntry) error {
+// It stops when the reader is exhausted or the context is cancelled.
+func follow(ctx context.Context, reader io.Reader, outCh chan api.LogEntry) {
 	scanner := bufio.NewScanner(reader)
 
 	for scanner.Scan() {
 		select {
 		case outCh <- entry(scanner.Bytes()):
 		case <-ctx.Done():
-			return nil
+			return
 		}
 	}
 	if err := scanner.Err(); err != nil {
 		outCh <- api.LogEntry{Err: fmt.Errorf("journal logs: %w", err)}
 	}
-	return nil
 }