spl: fit: Do not fail immediately if an overlay is not available

If one overlay that must be applied cannot be found in the FIT, the current
implementation stops applying the overlays. Let's make it skip only the
failing overlay instead.
Signed-off-by: NJean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: NSimon Glass <sjg@chromium.org>

common/spl/spl_fit.c

@@ -324,9 +324,13 @@ static int spl_fit_append_fdt(struct spl_image_info *spl_image,
 		for (; ; index++) {
 			node = spl_fit_get_image_node(fit, images, FIT_FDT_PROP,
 						      index);
-			if (node < 0) {
+			if (node == -E2BIG) {
 				debug("%s: No additional FDT node\n", __func__);
 				break;
+			} else if (node < 0) {
+				debug("%s: unable to find FDT node %d\n",
+				      __func__, index);
+				continue;
 			}
 
 			if (!tmpbuffer) {