Fix specifying a message via file.

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## UNRELEASED
 ### Changed
 - Use a human readable file name for private Ox keys.
+- Fix specifying a message via command line flag `-m`.
 
 ## [v0.8.2] 2024-01-19
 ### Changed

main.go

@@ -50,7 +50,7 @@ func readMessage(messageFilePath string) (string, error) {
 
 	// Check that message file is existing.
 	_, err = os.Stat(messageFilePath)
-	if os.IsNotExist(err) {
+	if err != nil {
 		return output, fmt.Errorf("readMessage: %w", err)
 	}
 
@@ -69,7 +69,7 @@ func readMessage(messageFilePath string) (string, error) {
 		}
 	}
 
-	if err := scanner.Err(); err != nil {
+	if err = scanner.Err(); err != nil {
 		if err != io.EOF {
 			return "", fmt.Errorf("readMessage: %w", err)
 		}
@@ -80,7 +80,7 @@ func readMessage(messageFilePath string) (string, error) {
 		fmt.Println("error while closing file:", err)
 	}
 
-	return output, fmt.Errorf("readMessage: %w", err)
+	return output, nil
 }
 
 func main() {