syslog: Correct syntax error

manifests/syslog/config/rsyslog.pp

@@ -55,7 +55,7 @@ define base::syslog::config::rsyslog(
             'wheezy': {
               file { '/etc/apt/preferences.d':
                 ensure => present,
-                source => source => 'puppet:///modules/base/syslog/etc/apt/preferences.d/rsyslog-wheezy',
+                source => 'puppet:///modules/base/syslog/etc/apt/preferences.d/rsyslog-wheezy',
               }
             }
           }