HID: hidraw: correctly deallocate memory on device disconnect

HID: hidraw: correctly deallocate memory on device disconnect

This changes puts the commit 79e04768ac1 back in place
with the fixes for slab corruption because of the commit.

When a device is unplugged, wait for all processes that
have opened the device to close before deallocating the device.

This commit was solving kernel crash because of the corruption in
rb tree of vmalloc. The rootcause was the device data pointer was
geting excessed after the memory associated with hidraw was freed.

The commit 79e04768ac1 was buggy as it was also freeing the hidraw
first and then calling delete operation on the list associated with
that hidraw leading to slab corruption.

Signed-off-by: Manoj Chourasia <mchourasia@nvidia.com>
Tested-by: Peter Wu <lekensteyn@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Jiri Kosina <jkosina@suse.cz>