UPSTREAM: mm/damon/sysfs-schemes: handle tried region directory allocation failure

DAMON sysfs interface's before_damos_apply callback
(damon_sysfs_before_damos_apply()), which creates the DAMOS tried regions
for each DAMOS action applied region, is not handling the allocation
failure for the sysfs directory data.  As a result, NULL pointer
derefeence is possible.  Fix it by handling the case.

Link: https://lkml.kernel.org/r/20231106233408.51159-4-sj@kernel.org


Fixes: f1d13cac ("mm/damon/sysfs: implement DAMOS tried regions update command")
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: <stable@vger.kernel.org>	[6.2+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

(cherry picked from commit ae636ae2)

Bug: 300502883
Bug: 319753692
Change-Id: I98568f4b0cee9fea82f4fe6d3e7a505370c3c304
Signed-off-by: cui yangpei <cuiyangpei@xiaomi.com>