Use NV_ENCODE_NATIVE for nvlist encoding variable

Use NV_ENCODE_NATIVE for nvlist encoding variable instead of 0.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Chris Dunlop <chris@onthe.net.au>
Signed-off-by: Tomohiro Kusumi <kusumi.tomohiro@gmail.com>
Closes openzfs#8653

module/nvpair/nvpair.c

@@ -2714,7 +2714,8 @@ nvlist_xunpack(char *buf, size_t buflen, nvlist_t **nvlp, nv_alloc_t *nva)
 	if ((err = nvlist_xalloc(&nvl, 0, nva)) != 0)
 		return (err);
 
-	if ((err = nvlist_common(nvl, buf, &buflen, 0, NVS_OP_DECODE)) != 0)
+	if ((err = nvlist_common(nvl, buf, &buflen, NV_ENCODE_NATIVE,
+	    NVS_OP_DECODE)) != 0)
 		nvlist_free(nvl);
 	else
 		*nvlp = nvl;