Minor rubocop gripe

Author: jhart-r7

modules/exploits/multi/local/at_persistence.rb

@@ -72,7 +72,7 @@ def exploit
       fail_with(Failure::NoAccess, 'User denied cron via at.deny')
     end
 
-    unless payload_file = datastore['PATH'] || cmd_exec('mktemp')
+    unless (payload_file = datastore['PATH'] || cmd_exec('mktemp'))
       fail_with(Failure::BadConfig, 'Unable to find suitable location for payload')
     end