optee: fix copy of optee reserved-memory node

Fix the loop that parses FDT for a reserved memory node named "optee".

Before this change, if at least one subnode was found in the
reserved-memory node, the function endlessly looped since instruction
continue returned back in the loop without updating variable subnode.
This change fixes the issue by using a for loop.

Fixes: 6ccb05ea ("image: fdt: copy possible optee nodes to a loaded devicetree")
Signed-off-by: NEtienne Carriere <etienne.carriere@linaro.org>
Signed-off-by: NPatrick Delaunay <patrick.delaunay@st.com>

lib/optee/optee.c

@@ -156,8 +156,9 @@ int optee_copy_fdt_nodes(const void *old_blob, void *new_blob)
 	/* optee inserts its memory regions as reserved-memory nodes */
 	nodeoffset = fdt_subnode_offset(old_blob, 0, "reserved-memory");
 	if (nodeoffset >= 0) {
-		subnode = fdt_first_subnode(old_blob, nodeoffset);
-		while (subnode >= 0) {
+		for (subnode = fdt_first_subnode(old_blob, nodeoffset);
+		     subnode >= 0;
+		     subnode = fdt_next_subnode(old_blob, subnode)) {
 			const char *name = fdt_get_name(old_blob,
 							subnode, NULL);
 			if (!name)
@@ -197,8 +198,6 @@ int optee_copy_fdt_nodes(const void *old_blob, void *new_blob)
 				if (ret < 0)
 					return ret;
 			}
-
-			subnode = fdt_next_subnode(old_blob, subnode);
 		}
 	}