Land rapid7#7109, Add final filesize to msfvenom output

Author: Brent Cook

lib/msf/core/payload_generator.rb

@@ -332,11 +332,16 @@ def generate_payload
         cli_print "Payload size: #{encoded_payload.length} bytes"
         gen_payload = format_payload(encoded_payload)
       end
+
       if gen_payload.nil?
         raise PayloadGeneratorError, 'The payload could not be generated, check options'
       elsif gen_payload.length > @space and not @smallest
         raise PayloadSpaceViolation, 'The payload exceeds the specified space'
       else
+        if format.to_s != 'raw'
+          cli_print "Final size of #{format} file: #{gen_payload.length} bytes"
+        end
+
         gen_payload
       end
     end