fix(sign): report parser err before missing SOA (#7775)

plugin/sign/file.go

@@ -80,13 +80,12 @@ func Parse(f io.Reader, origin, fileName string) (*file.Zone, error) {
 			}
 		}
 	}
+	if err := zp.Err(); err != nil {
+		return nil, err
+	}
 	if !seenSOA {
 		return nil, fmt.Errorf("file %q has no SOA record", fileName)
 	}
 
-	if err := zp.Err(); err != nil {
-		return nil, err
-	}
-
 	return z, nil
 }