of: Add check to of_scan_flat_dt() before accessing initial_boot_params

An empty __dtb_start to __dtb_end section might result in
initial_boot_params being null for arch/mips/ralink. This showed that the
boot process hangs indefinitely in of_scan_flat_dt().
Signed-off-by: Tobias Wolf <dev-NTEO@vplace.de>
Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14605/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

drivers/of/fdt.c

@@ -738,6 +738,9 @@ int __init of_scan_flat_dt(int (*it)(unsigned long node,
 	const char *pathp;
 	int offset, rc = 0, depth = -1;
 
+	if (!blob)
+		return 0;
+
 	for (offset = fdt_next_node(blob, -1, &depth);
 	     offset >= 0 && depth >= 0 && !rc;
 	     offset = fdt_next_node(blob, offset, &depth)) {