boot: Drop size parameter from image_setup_libfdt()

The of_size parameter is not used, so remove it.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/mips/lib/bootm.c b/arch/mips/lib/bootm.c
index d6d2f7d..f1cff69 100644
--- a/arch/mips/lib/bootm.c
+++ b/arch/mips/lib/bootm.c
@@ -246,8 +246,8 @@
 {
 	images->initrd_start = virt_to_phys((void *)images->initrd_start);
 	images->initrd_end = virt_to_phys((void *)images->initrd_end);
-	return image_setup_libfdt(images, images->ft_addr, images->ft_len,
-		&images->lmb);
+
+	return image_setup_libfdt(images, images->ft_addr, &images->lmb);
 }
 
 static void boot_prep_linux(struct bootm_headers *images)