image-fit: switch ENOLINK to ENOENT

ENOLINK is not required by POSIX and does not exist on OpenBSD
and likely other systems.

Signed-off-by: Jonathan Gray <jsg@jsg.id.au>
diff --git a/common/image-fit.c b/common/image-fit.c
index f833fe3..9ce68f1 100644
--- a/common/image-fit.c
+++ b/common/image-fit.c
@@ -1566,7 +1566,7 @@
 	noffset = fit_conf_get_prop_node(fit_hdr, cfg_noffset, prop_name);
 	if (noffset < 0) {
 		debug("*  %s: no '%s' in config\n", prop_name, prop_name);
-		return -ENOLINK;
+		return -ENOENT;
 	}
 
 	return noffset;