Reformat a code block to use next unless

This should be no difference in execution, but it pleases Rubocop in the
next commit when some code is added and makes review easier.

Author: ekohl

lib/puppet-lint.rb

@@ -158,14 +158,14 @@ def report(problems)
 
       message[:KIND] = message[:kind].to_s.upcase
 
-      if message[:kind] == :fixed || [message[:kind], :all].include?(configuration.error_level)
-        if configuration.json
-          message['context'] = get_context(message) if configuration.with_context
-          json << message
-        else
-          format_message(message)
-          print_context(message) if configuration.with_context
-        end
+      next unless message[:kind] == :fixed || [message[:kind], :all].include?(configuration.error_level)
+
+      if configuration.json
+        message['context'] = get_context(message) if configuration.with_context
+        json << message
+      else
+        format_message(message)
+        print_context(message) if configuration.with_context
       end
     end
     puts JSON.pretty_generate(json) if configuration.json