Fix CheckRender error with nested render calls

Fixes #484

lib/brakeman/checks/check_render.rb

@@ -8,11 +8,11 @@ class Brakeman::CheckRender < Brakeman::BaseCheck
 
   def run_check
     tracker.find_call(:target => nil, :method => :render).each do |result|
-      process_render result
+      process_render_result result
     end
   end
 
-  def process_render result
+  def process_render_result result
     return unless node_type? result[:call], :render
 
     case result[:call].render_type

test/apps/rails4/app/views/users/index.html.erb

@@ -11,3 +11,5 @@
 <%= number_to_human(params[:cost], format: h(params[:format])) %> Should not warn
 
 <%= number_to_percentage(params[:cost], negative_format: params[:format]) %>
+
+<%= render Thing.new(content: render(partial: "stuff")) %>