Support different encoding types in certificate.get_encoding()

src/pki/commands/issue.c

@@ -301,8 +301,7 @@ static int issue()
 		error = "generating certificate failed";
 		goto end;
 	}
-	encoding = cert->get_encoding(cert);
-	if (!encoding.ptr)
+	if (!cert->get_encoding(cert, CERT_ASN1_DER, &encoding))
 	{
 		error = "encoding certificate failed";
 		goto end;

src/pki/commands/req.c

@@ -128,8 +128,7 @@ static int req()
 		error = "generating certificate request failed";
 		goto end;
 	}
-	encoding = cert->get_encoding(cert);
-	if (!encoding.ptr)
+	if (!cert->get_encoding(cert, CERT_ASN1_DER, &encoding))
 	{
 		error = "encoding certificate request failed";
 		goto end;

src/pki/commands/self.c

@@ -193,8 +193,7 @@ static int self()
 		error = "generating certificate failed";
 		goto end;
 	}
-	encoding = cert->get_encoding(cert);
-	if (!encoding.ptr)
+	if (!cert->get_encoding(cert, CERT_ASN1_DER, &encoding))
 	{
 		error = "encoding certificate failed";
 		goto end;

src/pki/commands/signcrl.c

@@ -314,8 +314,7 @@ static int sign_crl()
 		error = "generating CRL failed";
 		goto error;
 	}
-	encoding = crl->get_encoding(crl);
-	if (!encoding.ptr)
+	if (!crl->get_encoding(crl, CERT_ASN1_DER, &encoding))
 	{
 		error = "encoding CRL failed";
 		goto error;