rb: Validate struct _after_ read. [THRIFT-206]


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@714069 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/lib/rb/lib/thrift/struct.rb b/lib/rb/lib/thrift/struct.rb
index a51f209..4b99168 100644
--- a/lib/rb/lib/thrift/struct.rb
+++ b/lib/rb/lib/thrift/struct.rb
@@ -82,7 +82,6 @@
     end
 
     def read(iprot)
-      validate
       # TODO(kevinclark): Make sure transport is C readable
       if iprot.respond_to?(:decode_binary)
         iprot.decode_binary(self, iprot.trans)
@@ -96,6 +95,7 @@
         end
         iprot.read_struct_end
       end
+      validate
     end
 
     def write(oprot)