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>

drivers/mfd/twl4030-irq.c

@@ -638,8 +638,10 @@ int twl4030_sih_setup(struct device *dev, int module, int irq_base)
 		}
 	}
 
-	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)