Fix issue with iterationsAllowed

Author: frederikstonge

packages/flutter_migrate/lib/src/utils.dart

@@ -135,7 +135,7 @@ class MigrateUtils {
         await _runCommand(cmdArgs, workingDirectory: outputDirectory);
     final String error = result.stderr as String;
 
-    // Catch errors due to parameters not supported anymore for apps in flutter 3.35
+    // ios-language is not supported anymore for apps in flutter 3.35.
     if (error.contains(
         'The "ios-language" option is only supported for "--template=plugin".')) {
       return createFromTemplates(
@@ -146,7 +146,7 @@ class MigrateUtils {
         iosLanguage: null,
         outputDirectory: outputDirectory,
         platforms: platforms,
-        iterationsAllowed: iterationsAllowed--,
+        iterationsAllowed: iterationsAllowed - 1,
       );
     }
 
@@ -159,7 +159,7 @@ class MigrateUtils {
         androidLanguage: androidLanguage,
         iosLanguage: iosLanguage,
         outputDirectory: outputDirectory,
-        iterationsAllowed: iterationsAllowed--,
+        iterationsAllowed: iterationsAllowed - 1,
       );
     }
     // Old versions of the tool does not include the project-name option.
@@ -173,7 +173,7 @@ class MigrateUtils {
         iosLanguage: iosLanguage,
         outputDirectory: outputDirectory,
         platforms: platforms,
-        iterationsAllowed: iterationsAllowed--,
+        iterationsAllowed: iterationsAllowed - 1,
       );
     }
     if (error.contains('Multiple output directories specified.')) {
@@ -185,7 +185,7 @@ class MigrateUtils {
           androidLanguage: androidLanguage,
           iosLanguage: iosLanguage,
           outputDirectory: outputDirectory,
-          iterationsAllowed: iterationsAllowed--,
+          iterationsAllowed: iterationsAllowed - 1,
         );
       }
     }