libfdt: Drop -FDT_ERR_TOODEEP

This error code has not been upstreamed and is not really needed since it
is unlikely to be triggered. Drop it to maintain compatability with
upstream.

Reported-by: Peter Robinson <pbrobinson@gmail.com>

Signed-off-by: Simon Glass <sjg@chromium.org>
Tested-by: Peter Robinson <pbrobinson@gmail.com>

lib/libfdt/fdt_region.c

@@ -397,7 +397,7 @@ int fdt_next_region(const void *fdt,
 			last_node = offset;
 			p.depth++;
 			if (p.depth == FDT_MAX_DEPTH)
-				return -FDT_ERR_TOODEEP;
+				return -FDT_ERR_BADSTRUCTURE;
 			name = fdt_get_name(fdt, offset, &len);
 			if (p.end - path + 2 + len >= path_len)
 				return -FDT_ERR_NOSPACE;

lib/libfdt/libfdt.h

@@ -93,12 +93,7 @@
 	/* FDT_ERR_NOPHANDLES: The device tree doesn't have any
 	 * phandle available anymore without causing an overflow */
 
-#define FDT_ERR_TOODEEP	18
-	/* FDT_ERR_TOODEEP: The depth of a node has exceeded the internal
-	 * libfdt limit. This can happen if you have more than
-	 * FDT_MAX_DEPTH nested nodes. */
-
-#define FDT_ERR_MAX		18
+#define FDT_ERR_MAX		17
 
 /**********************************************************************/
 /* Low-level functions (you probably don't need these)                */