staging: iio_simple_dummy: fix init function

This patch fixes the init function for the iio_simple_dummy driver.
The main issues were absence of kfree for the allocated array, and no
devices being removed in case the probe function fails, running in a loop.
Signed-off-by: Vladimirs Ambrosovs <rodriguez.twister@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/staging/iio/iio_simple_dummy.c

@@ -722,9 +722,16 @@ static __init int iio_dummy_init(void)
 	for (i = 0; i < instances; i++) {
 		ret = iio_dummy_probe(i);
 		if (ret < 0)
-			return ret;
+			goto error_remove_devs;
 	}
 	return 0;
+
+error_remove_devs:
+	while (i--)
+		iio_dummy_remove(i);
+
+	kfree(iio_dummy_devs);
+	return ret;
 }
 module_init(iio_dummy_init);