Skip re-reading entries that were just written

This addresses #360.

trusted_applet/internal/storage/slots/journal.go

@@ -164,19 +164,9 @@ func (j *Journal) Update(data []byte) error {
 		return fmt.Errorf("failed to write blocks: %v", err)
 	}
 
-	// Attempt to re-read the entry we just wrote to make sure that all is well...
-	br := newBlockReader(j.dev, j.nextBlock)
-	latest, err := unmarshalEntry(br)
-	if err != nil {
-		return fmt.Errorf("failed to re-scan written entry: %v", err)
-	}
-	if got, want := latest.Revision, e.Revision; got != want {
-		return fmt.Errorf("journal error, latest entry revision %d != written revision %d", got, want)
-	}
-
 	// Finally, update the journal state.
 	j.nextBlock += numBlocks
-	j.current = *latest
+	j.current = e
 
 	return nil
 }