Cleanup PayloadSigner::AddSignatureToManifest()

Change-Id: Idbde802b06f18fb26160586b7fe34c104c1b0bf9
diff --git a/payload_generator/payload_signer.cc b/payload_generator/payload_signer.cc
index dd87ab7..d9f0dd7 100644
--- a/payload_generator/payload_signer.cc
+++ b/payload_generator/payload_signer.cc
@@ -241,8 +241,6 @@
                                            DeltaArchiveManifest* manifest) {
   LOG(INFO) << "Making room for signature in file";
   manifest->set_signatures_offset(signature_blob_offset);
-  LOG(INFO) << "set? " << manifest->has_signatures_offset();
-  manifest->set_signatures_offset(signature_blob_offset);
   manifest->set_signatures_size(signature_blob_length);
 }