xmlsecurity: fix loplugin:passstuffbyref warnings

Change-Id: I627abfe33e9c2fc4243276706c1624ce19943678

xmlsecurity/inc/digitalsignaturesdialog.hxx

@@ -103,7 +103,7 @@ private:
 
     css::uno::Reference<css::security::XCertificate> getCertificate(const SignatureInformation& rInfo);
     css::uno::Reference<css::xml::crypto::XSecurityEnvironment> getSecurityEnvironmentForCertificate(
-        css::uno::Reference<css::security::XCertificate> xCert);
+        const css::uno::Reference<css::security::XCertificate>& xCert);
 
     //Checks if adding is allowed.
     //See the spec at specs/www/appwide/security/Electronic_Signatures_and_Security.sxw

xmlsecurity/inc/documentsignaturemanager.hxx

@@ -62,7 +62,7 @@ public:
     SignatureStreamHelper ImplOpenSignatureStream(sal_Int32 eStreamMode, bool bTempStream);
     /// Add a new signature, using xCert as a signing certificate, and rDescription as description.
     bool add(const css::uno::Reference<css::security::XCertificate>& xCert,
-             const css::uno::Reference<css::xml::crypto::XXMLSecurityContext> xSecurityContext,
+             const css::uno::Reference<css::xml::crypto::XXMLSecurityContext>& xSecurityContext,
              const OUString& rDescription, sal_Int32& nSecurityId, bool bAdESCompliant);
     /// Remove signature at nPosition.
     void remove(sal_uInt16 nPosition);

xmlsecurity/source/dialogs/digitalsignaturesdialog.cxx

@@ -675,7 +675,7 @@ uno::Reference<security::XCertificate> DigitalSignaturesDialog::getCertificate(c
     return xCert;
 }
 
-uno::Reference<xml::crypto::XSecurityEnvironment> DigitalSignaturesDialog::getSecurityEnvironmentForCertificate(uno::Reference<security::XCertificate> xCert)
+uno::Reference<xml::crypto::XSecurityEnvironment> DigitalSignaturesDialog::getSecurityEnvironmentForCertificate(const uno::Reference<security::XCertificate>& xCert)
 {
     if (xCert->getCertificateKind() == CertificateKind_OPENPGP)
         return maSignatureManager.getGpgSecurityEnvironment();

xmlsecurity/source/helper/documentsignaturemanager.cxx

@@ -254,7 +254,7 @@ SignatureStreamHelper DocumentSignatureManager::ImplOpenSignatureStream(sal_Int3
 }
 
 bool DocumentSignatureManager::add(const uno::Reference<security::XCertificate>& xCert,
-                                   const uno::Reference<xml::crypto::XXMLSecurityContext> xSecurityContext,
+                                   const uno::Reference<xml::crypto::XXMLSecurityContext>& xSecurityContext,
                                    const OUString& rDescription,
                                    sal_Int32& nSecurityId,
                                    bool bAdESCompliant)