Syntax and style fixes.

app/models/project.rb

@@ -391,7 +391,10 @@ class Project < ActiveRecord::Base
   end
   def lfs_enabled?
-    (Gitlab.config.lfs.enabled && enable_lfs) || (enable_lfs.nil? && Gitlab.config.lfs.enabled)
+    return false unless Gitlab.config.lfs.enabled
+    return Gitlab.config.lfs.enabled if enable_lfs.nil?
+
+    enable_lfs
   end
   def repository_storage_path

app/views/projects/edit.html.haml

@@ -84,7 +84,7 @@
             .form-group
               .checkbox
                 = f.label :enable_lfs do
-                  = f.check_box :enable_lfs, checked: (true if @project.enable_lfs || @project.enable_lfs.nil?)
+                  = f.check_box :enable_lfs, checked: @project.lfs_enabled?
                   %strong LFS
                   %br
                   %span.descr Git Large File Storage