drivers: sunxi-rsb: fix error output type

"len" is actually a size_t in this function here, so properly annotate
the dev_err printf type to allow compilation for 64-bit architectures.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
diff --git a/drivers/bus/sunxi-rsb.c b/drivers/bus/sunxi-rsb.c
index 25996e2..795c9d9 100644
--- a/drivers/bus/sunxi-rsb.c
+++ b/drivers/bus/sunxi-rsb.c
@@ -330,7 +330,7 @@
 		cmd = RSB_CMD_RD32;
 		break;
 	default:
-		dev_err(rsb->dev, "Invalid access width: %d\n", len);
+		dev_err(rsb->dev, "Invalid access width: %zd\n", len);
 		return -EINVAL;
 	}
 
@@ -372,7 +372,7 @@
 		cmd = RSB_CMD_WR32;
 		break;
 	default:
-		dev_err(rsb->dev, "Invalid access width: %d\n", len);
+		dev_err(rsb->dev, "Invalid access width: %zd\n", len);
 		return -EINVAL;
 	}