Fix non-rubyisms

lib/rex/post/meterpreter/extensions/extapi/clipboard/clipboard.rb

@@ -34,7 +34,7 @@ class Clipboard
 
     text = response.get_tlv_value(TLV_TYPE_EXT_CLIPBOARD_TYPE_TEXT)
 
-    if not text.nil?
+    if text
       results << {
         :type => :text,
         :data => text
@@ -57,7 +57,7 @@ class Clipboard
     end
 
     response.each(TLV_TYPE_EXT_CLIPBOARD_TYPE_IMAGE_JPG) do |jpg|
-      if not jpg.nil?
+      if jpg
         results << {
           :type   => :jpg,
           :width  => jpg.get_tlv_value(TLV_TYPE_EXT_CLIPBOARD_TYPE_IMAGE_JPG_DIMX),

lib/rex/post/meterpreter/extensions/extapi/service/service.rb

@@ -20,7 +20,7 @@ class Service
   end
 
   # Enumerate all the services on the target.
-  def enumerate()
+  def enumerate
     request = Packet.create_request('extapi_service_enum')
     response = client.send_request(request)
 

lib/rex/post/meterpreter/ui/console/command_dispatcher/extapi/service.rb

@@ -67,7 +67,7 @@ class Console::CommandDispatcher::Extapi::Service
       7 => "Paused"
     }
 
-    services = client.extapi.service.enumerate()
+    services = client.extapi.service.enumerate
 
     table = Rex::Ui::Text::Table.new(
       'Header'    => 'Service List',