UPSTREAM: HID: core: zero-initialize the report buffer

[ Upstream commit 177f25d1292c7e16e1199b39c85480f7f8815552 ]

Since the report buffer is used by all kinds of drivers in various ways, let's
zero-initialize it during allocation to make sure that it can't be ever used
to leak kernel memory via specially-crafted report.

Bug: 380395346
Fixes: 27ce4050 ("HID: fix data access in implement()")
Reported-by: Benoît Sevens <bsevens@google.com>
Acked-by: Benjamin Tissoires <bentiss@kernel.org>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit 9d9f5c75c0c7f31766ec27d90f7a6ac673193191)
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: I31f64f2745347137bbc415eb35b7fab5761867f3