Fix missing error check of bufio.Scanner (#29882)

maybe more

(cherry picked from commit 0e183d81fc5283f9d2047472de580e4f04a046c1)

models/asymkey/ssh_key_authorized_keys.go

@@ -211,6 +211,10 @@ func RegeneratePublicKeys(ctx context.Context, t io.StringWriter) error {
 				return err
 			}
 		}
+		err = scanner.Err()
+		if err != nil {
+			return fmt.Errorf("scan: %w", err)
+		}
 		f.Close()
 	}
 	return nil

models/asymkey/ssh_key_authorized_principals.go

@@ -133,6 +133,10 @@ func regeneratePrincipalKeys(ctx context.Context, t io.StringWriter) error {
 				return err
 			}
 		}
+		err = scanner.Err()
+		if err != nil {
+			return fmt.Errorf("scan: %w", err)
+		}
 		f.Close()
 	}
 	return nil