[nft PATCH 08/14] JSON: Simplify tcp option expression parsing a bit

[Phil Sutter]

When parsing the optional "field" property, use return code of
json_unpack() directly to check if it was present or not.

Signed-off-by: Phil Sutter <p...@nwl.cc>
---
 src/parser_json.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/parser_json.c b/src/parser_json.c
index f3d2c0f1d3dfc..bd1c0a04993c8 100644
--- a/src/parser_json.c
+++ b/src/parser_json.c
@@ -479,20 +479,19 @@ static struct expr *json_parse_payload_expr(struct 
json_ctx *ctx,
 static struct expr *json_parse_tcp_option_expr(struct json_ctx *ctx,
                                               const char *type, json_t *root)
 {
-       const char *desc, *field = NULL;
+       const char *desc, *field;
        int descval, fieldval;
        struct expr *expr;
 
        if (json_unpack_err(ctx, root, "{s:s}", "name", &desc))
                return NULL;
-       json_unpack(root, "{s:s}", "field", &field);
 
        if (json_parse_tcp_option_type(desc, &descval)) {
                json_error(ctx, "Unknown tcp option name '%s'.", desc);
                return NULL;
        }
 
-       if (!field) {
+       if (json_unpack(root, "{s:s}", "field", &field)) {
                expr = tcpopt_expr_alloc(int_loc, descval,
                                         TCPOPTHDR_FIELD_KIND);
                expr->exthdr.flags = NFT_EXTHDR_F_PRESENT;
-- 
2.17.0

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