ec2_vol module filtering bug (#65960)

* Update ec2_vol.py

When `name` is specified, it ignores `zone` filter. That is you could not have same tag:Name in different zones.

* Add changelog fragment

changelogs/fragments/65960-ec2_vol-filtering-bugfix.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - "ec2_vol - fix filtering bug"

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

@@ -267,7 +267,7 @@ def get_volume(module, ec2):
     if zone:
         filters['availability_zone'] = zone
     if name:
-        filters = {'tag:Name': name}
+        filters['tag:Name'] = name
     if id:
         volume_ids = [id]
     try: