add missing :

Author: Tim Meusel

manifests/master.pp

@@ -104,7 +104,7 @@
   $puppetdb_version           = 'present',
   $disable_master             = $::puppet::params::disable_master,
   $upstream                   = $::puppet::params::upstream,
-  $backend_process_number     = $::puppet::params:backend_process_number,
+  $backend_process_number     = $::puppet::params::backend_process_number,
 ) inherits puppet::params {
 
   anchor { 'puppet::master::begin': }