Fix get_special_prop() build failure

The cast of the size_t returned by strlcpy() to a uint64_t by the
VERIFY3U can result in a build failure when CONFIG_FORTIFY_SOURCE
is set.  This is due to the additional hardening.  Since the token
is expected to always fit in strval the VERIFY3U has been removed.
If somehow it doesn't, it will still be safely truncated.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Don Brady <don.brady@delphix.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue openzfs#8999
Closes openzfs#9020

module/zfs/zcp_get.c

@@ -423,13 +423,11 @@ get_special_prop(lua_State *state, dsl_dataset_t *ds, const char *dsname,
 	case ZFS_PROP_RECEIVE_RESUME_TOKEN: {
 		char *token = get_receive_resume_stats_impl(ds);
 
-		VERIFY3U(strlcpy(strval, token, ZAP_MAXVALUELEN),
-		    <, ZAP_MAXVALUELEN);
+		(void) strlcpy(strval, token, ZAP_MAXVALUELEN);
 		if (strcmp(strval, "") == 0) {
 			char *childval = get_child_receive_stats(ds);
 
-			VERIFY3U(strlcpy(strval, childval, ZAP_MAXVALUELEN),
-			    <, ZAP_MAXVALUELEN);
+			(void) strlcpy(strval, childval, ZAP_MAXVALUELEN);
 			if (strcmp(strval, "") == 0)
 				error = ENOENT;