[cloud] ec2_vol module snapshot and volume_size are not mutually exclusive (#26764)

lib/ansible/modules/cloud/amazon/ec2_vol.py

@@ -609,8 +609,8 @@ def main():
     if not volume_size and not (id or name or snapshot):
         module.fail_json(msg="You must specify volume_size or identify an existing volume by id, name, or snapshot")
 
-    if volume_size and (id or snapshot):
+    if volume_size and id:
-        module.fail_json(msg="Cannot specify volume_size together with id or snapshot")
+        module.fail_json(msg="Cannot specify volume_size together with id")
 
     if state == 'present':
         volume, changed = create_volume(module, ec2, zone)