[ARM] fix impd1.c build warning

  CC      arch/arm/mach-integrator/impd1.o
arch/arm/mach-integrator/impd1.c: In function `impd1_probe':
arch/arm/mach-integrator/impd1.c:408: warning: too few arguments for format

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-integrator/impd1.c

@@ -405,7 +405,7 @@ static int impd1_probe(struct lm_device *dev)
 
 		ret = amba_device_register(d, &dev->resource);
 		if (ret) {
-			dev_err(&d->dev, "unable to register device: %d\n");
+			dev_err(&d->dev, "unable to register device: %d\n", ret);
 			kfree(d);
 		}
 	}