Clean up conditional statement in `name` method.

Reverse the conditional order to avoid awkward `if !` construction.

lib/gitlab/oauth/user.rb

@@ -65,10 +65,10 @@ module Gitlab
         end
 
         def name
-          if !auth.info.name.nil?
-            auth.info.name.to_s.force_encoding('utf-8')
-          else
+          if auth.info.name.nil?
             "#{auth.info.first_name} #{auth.info.last_name}".force_encoding('utf-8')
+          else
+            auth.info.name.to_s.force_encoding('utf-8')
           end
         end