fix linker error

Author: ashwin-simplyblock

module/bdev/lvol/vbdev_lvol_rpc.c

@@ -1185,7 +1185,7 @@ rpc_dump_lvol(struct spdk_json_write_ctx *w, struct spdk_lvol *lvol)
 	spdk_json_write_named_bool(w, "is_clone", spdk_blob_is_clone(lvol->blob));
 	spdk_json_write_named_bool(w, "is_esnap_clone", spdk_blob_is_esnap_clone(lvol->blob));
 	spdk_json_write_named_bool(w, "is_degraded", spdk_blob_is_degraded(lvol->blob));
-	spdk_json_write_named_int(w, "lvol_priority_class", lvol->priority_class);
+	spdk_json_write_named_uint(w, "lvol_priority_class", lvol->priority_class);
 
 	spdk_json_write_named_object_begin(w, "lvs");
 	spdk_json_write_named_string(w, "name", lvs->name);