Input: zforce - fix error return code in zforce_start()

The error code was not set if unable to set config, so the error
condition wasn't reflected in the return value. Fix to return a
negative error code from the error handling case instead of 0.

Signed-off-by: Wei Yongjun <[e-mail]>
Acked-by: Heiko Stuebner <[e-mail]>
Signed-off-by: Dmitry Torokhov <[e-mail]>

drivers/input/touchscreen/zforce_ts.c

···
 		goto error;
 	}
 
-	if (zforce_setconfig(ts, SETCONFIG_DUALTOUCH)) {
+	ret = zforce_setconfig(ts, SETCONFIG_DUALTOUCH);
+	if (ret) {
 		dev_err(&client->dev, "Unable to set config\n");
 		goto error;
 	}