mfd: twl4030-irq: Log an error in twl4030_sih_setup if the module cannot be found

As silently failing isn't that nice, emit an error message at a place
that was silent on failure up to now.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
diff --git a/drivers/mfd/twl4030-irq.c b/drivers/mfd/twl4030-irq.c
index b46c0cf..378c02d 100644
--- a/drivers/mfd/twl4030-irq.c
+++ b/drivers/mfd/twl4030-irq.c
@@ -638,8 +638,10 @@
 		}
 	}
 
-	if (status < 0)
+	if (status < 0) {
+		dev_err(dev, "module to setup SIH for not found\n");
 		return status;
+	}
 
 	agent = kzalloc(sizeof(*agent), GFP_KERNEL);
 	if (!agent)