This refs #1415, but is strange and should not happen. RRset should be...

This refs #1415, but is strange and should not happen. RRset should be initialized to NULL before calling this function.

src/knot/zone/zone-load.c

@@ -1160,7 +1160,7 @@ void knot_zload_close(zloader_t *loader)
 int knot_zload_rrset_deserialize(knot_rrset_t **rrset,
                                    uint8_t *stream, size_t *size)
 {
-	if (stream == NULL || size == 0 || *rrset != NULL) {
+	if (stream == NULL || size == 0) {
 		return KNOT_EBADARG;
 	}