Tidy up existing code

gems/aws-sdk-core/lib/aws-sdk-core/ec2_metadata.rb

@@ -182,10 +182,8 @@ def http_put(connection, ttl)
           response.body,
           response.header['x-aws-ec2-metadata-token-ttl-seconds'].to_i
         ]
-      when 400
-        raise TokenRetrievalError
-      when 403
-        raise RequestForbiddenError
+      when 400 then raise TokenRetrievalError
+      when 403 then raise RequestForbiddenError
       end
     end
 

gems/aws-sdk-core/lib/aws-sdk-core/instance_profile_credentials.rb

@@ -119,7 +119,7 @@ def refresh
     end
 
     def fetch_credentials
-      return '{}' if _metadata_disabled?
+      return '{}' if metadata_disabled?
 
       metadata = @client.get(METADATA_PATH_BASE)
       profile_name = metadata.lines.first.strip
@@ -143,7 +143,7 @@ def update_credentials(creds)
       warn_expired_credentials
     end
 
-    def _metadata_disabled?
+    def metadata_disabled?
       ENV.fetch('AWS_EC2_METADATA_DISABLED', 'false').downcase == 'true'
     end