Fix small memory leak in SignatureHandler::getCertificateInfo
diff --git a/poppler/SignatureHandler.cc b/poppler/SignatureHandler.cc
index 0afc159..123dee7 100644
--- a/poppler/SignatureHandler.cc
+++ b/poppler/SignatureHandler.cc
@@ -190,6 +190,8 @@
   certInfo->setCertificateDER(SECItemToGooString(cert->derCert));
   certInfo->setIsSelfSigned(CERT_CompareName(&cert->subject, &cert->issuer) == SECEqual);
 
+  SECKEY_DestroyPublicKey(pk);
+
   return certInfo;
 }