nios2: fix bootm error on fdt args

We should check argv[3] only if there are enough args. Otherwise, it might cause invalid memory access fault.

Signed-off-by Thomas Chou <[email protected]>

---
 arch/nios2/lib/bootm.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

arch/nios2/lib/bootm.c +1 -1

index defa1fc..6d339e8 100644
@@ -42,7 +42,7 @@ int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
 	if (boot_get_fdt(flag, argc, argv, images, &of_flat_tree, &of_size))
 		return 1;
 #endif
-	if (!of_flat_tree)
+	if (!of_flat_tree && argc > 3)
 		of_flat_tree = (char *)simple_strtoul(argv[3], NULL, 16);
 	if (of_flat_tree)
 		initrd_end = (ulong)of_flat_tree;