[PATCH 2.6.19-rc6] Fix device_attribute memory leak in device_del

[Catalin Marinas <catalin.marinas@gmail.com>]

dev->devt_attr is allocated in device_add() but it is never freed in
device_del() in the drivers/base/core.c file (reported by kmemleak).

Signed-off-by: Catalin Marinas <catalin.marinas@gmail.com>
---

I sent this patch before for 2.6.18 but it probably got lost. Anyway,
I found the bug again while testing kmemleak.

 drivers/base/core.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 68ad11a..002fde4 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -591,8 +591,10 @@ void device_del(struct device * dev)
 
 	if (parent)
 		klist_del(&dev->knode_parent);
-	if (dev->devt_attr)
+	if (dev->devt_attr) {
 		device_remove_file(dev, dev->devt_attr);
+		kfree(dev->devt_attr);
+	}
 	if (dev->class) {
 		sysfs_remove_link(&dev->kobj, "subsystem");
 		sysfs_remove_link(&dev->class->subsys.kset.kobj, dev->bus_id);
-
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