[PATCH] spi: check platform_device_register_simple() error

Check the return value of platform_device_register_simple().

Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/spi/spi_butterfly.c

@@ -251,6 +251,8 @@ static void butterfly_attach(struct parport *p)
 	 * setting up a platform device like this is an ugly kluge...
 	 */
 	pdev = platform_device_register_simple("butterfly", -1, NULL, 0);
+	if (IS_ERR(pdev))
+		return;
 
 	master = spi_alloc_master(&pdev->dev, sizeof *pp);
 	if (!master) {