Input: matrix-keymap - switch to using __free() cleanup facility

Use __free(kfree) cleanup facility in matrix_keypad_parse_keymap() to
automatically free temporarily allocated memory.

Reviewed-by: Hans de Goede <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Dmitry Torokhov <[e-mail]>

drivers/input/matrix-keymap.c

···
 	struct device *dev = input_dev->dev.parent;
 	unsigned int row_shift = get_count_order(cols);
 	unsigned int max_keys = rows << row_shift;
-	u32 *keys;
 	int i;
 	int size;
-	int retval;
+	int error;
 
 	if (!propname)
 		propname = "linux,keymap";
···
 		return -EINVAL;
 	}
 
-	keys = kmalloc_array(size, sizeof(u32), GFP_KERNEL);
+	u32 *keys __free(kfree) = kmalloc_array(size, sizeof(*keys), GFP_KERNEL);
 	if (!keys)
 		return -ENOMEM;
 
-	retval = device_property_read_u32_array(dev, propname, keys, size);
-	if (retval) {
+	error = device_property_read_u32_array(dev, propname, keys, size);
+	if (error) {
 		dev_err(dev, "failed to read %s property: %d\n",
-			propname, retval);
-		goto out;
+			propname, error);
+		return error;
 	}
 
 	for (i = 0; i < size; i++) {
 		if (!matrix_keypad_map_key(input_dev, rows, cols,
-					   row_shift, keys[i])) {
-			retval = -EINVAL;
-			goto out;
-		}
+					   row_shift, keys[i]))
+			return -EINVAL;
 	}
 
-	retval = 0;
-
-out:
-	kfree(keys);
-	return retval;
+	return 0;
 }
 
 /**