[aws] Fix check mode bug in ec2_key (#45320)

Fix incorrect ec2_key check-mode behavior when a key already exists and key_material has been provided

lib/ansible/modules/cloud/amazon/ec2_key.py

@@ -186,13 +186,16 @@ def create_key_pair(module, ec2_client, name, key_material, force):
     key = find_key_pair(module, ec2_client, name)
     if key:
         if key_material and force:
+            if not module.check_mode:
                 new_fingerprint = get_key_fingerprint(module, ec2_client, key_material)
                 if key['KeyFingerprint'] != new_fingerprint:
-                if not module.check_mode:
                     delete_key_pair(module, ec2_client, name, finish_task=False)
                     key = import_key_pair(module, ec2_client, name, key_material)
                     key_data = extract_key_data(key)
                     module.exit_json(changed=True, key=key_data, msg="key pair updated")
+            else:
+                # Assume a change will be made in check mode since a comparison can't be done
+                module.exit_json(changed=True, key=extract_key_data(key), msg="key pair updated")
         key_data = extract_key_data(key)
         module.exit_json(changed=False, key=key_data, msg="key pair already exists")
     else: