lib/dns/tests/rbt_serialize_test.c: Fix dereference before DbC check
(cherry picked from commit 14c174d921)
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@@ -173,7 +173,7 @@ write_data(FILE *file, unsigned char *datap, void *arg, uint64_t *crc) {
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static isc_result_t
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fix_data(dns_rbtnode_t *p, void *base, size_t max, void *arg, uint64_t *crc) {
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data_holder_t *data = p->data;
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data_holder_t *data;
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size_t size;
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UNUSED(base);
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@@ -183,6 +183,7 @@ fix_data(dns_rbtnode_t *p, void *base, size_t max, void *arg, uint64_t *crc) {
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REQUIRE(crc != NULL);
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REQUIRE(p != NULL);
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data = p->data;
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if (data == NULL ||
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(data->len == 0 && data->data != NULL) ||
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