lib: rsa: rsa-verify: don't look for keys in the FIT image

In the function rsa_verify_hash, if the "main" key doesn't
work, u-boot try others keys. But it searches those keys
in the FIT image instead of the u-boot device tree.

Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/lib/rsa/rsa-verify.c b/lib/rsa/rsa-verify.c
index 0ab0f62..e34d329 100644
--- a/lib/rsa/rsa-verify.c
+++ b/lib/rsa/rsa-verify.c
@@ -522,10 +522,10 @@
 			return ret;
 
 		/* No luck, so try each of the keys in turn */
-		for (ndepth = 0, noffset = fdt_next_node(info->fit, sig_node,
+		for (ndepth = 0, noffset = fdt_next_node(blob, sig_node,
 							 &ndepth);
 		     (noffset >= 0) && (ndepth > 0);
-		     noffset = fdt_next_node(info->fit, noffset, &ndepth)) {
+		     noffset = fdt_next_node(blob, noffset, &ndepth)) {
 			if (ndepth == 1 && noffset != node) {
 				ret = rsa_verify_with_keynode(info, hash,
 							      sig, sig_len,