ARM: zImage: atags_to_fdt: Fix node names on added root nodes

Commit 7536c7e03e74 ("of/fdt: Remove redundant kbasename function
call") exposed a bug creating DT nodes in the ATAGS to DT fixup code.
Non-existent nodes would mistaken get created with a leading '/'. The
problem was fdt_path_offset() takes a full path while creating a node
with fdt_add_subnode() takes just the basename.

Since this we only add root child nodes, we can just skip over the '/'.

Fixes: 7536c7e03e74 ("of/fdt: Remove redundant kbasename function call")
Reported-by: Chris Packham <[e-mail]>
Cc: Qi Zheng <[e-mail]>
Cc: Russell King <[e-mail]>
Signed-off-by: Rob Herring <[e-mail]>
Tested-by: Chris Packham <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

arch/arm/boot/compressed/atags_to_fdt.c

···
 {
 	int offset = fdt_path_offset(fdt, node_path);
 	if (offset == -FDT_ERR_NOTFOUND)
-		offset = fdt_add_subnode(fdt, 0, node_path);
+		/* Add the node to root if not found, dropping the leading '/' */
+		offset = fdt_add_subnode(fdt, 0, node_path + 1);
 	return offset;
 }