Update sp_BlitzLock.sql

Filter on the `object_name` from `fn_xe_file_target_read_file`

Author: erikdarlingdata

sp_BlitzLock.sql

@@ -905,12 +905,13 @@ BEGIN
             SELECT
                 deadlock_xml =
                     TRY_CAST(fx.event_data AS xml)
-            FROM sys.fn_xe_file_target_read_file('system_health*.xel', NULL, NULL, NULL) AS fx
+            FROM sys.fn_xe_file_target_read_file(N'system_health*.xel', NULL, NULL, NULL) AS fx
             LEFT JOIN #t AS t
               ON 1 = 1
+			WHERE fx.object_name = N'xml_deadlock_report'
         ) AS xml
         CROSS APPLY xml.deadlock_xml.nodes('/event') AS e(x)
-        WHERE e.x.exist('@name[ . = "xml_deadlock_report"]') = 1
+        WHERE 1 = 1
         AND   e.x.exist('@timestamp[. >= sql:variable("@StartDate")]') = 1
         AND   e.x.exist('@timestamp[. <  sql:variable("@EndDate")]') = 1
         OPTION(RECOMPILE);