inotify: Use strscpy() for event->name copies

inotify: Use strscpy() for event->name copies

Since we have already allocated "len + 1" space for event->name, make sure
that name->name cannot ever accidentally cause a copy overflow by calling
strscpy() instead of the unbounded strcpy() routine. This assists in
the ongoing efforts to remove the unsafe strcpy() API[1] from the kernel.

Link: https://github.com/KSPP/linux/issues/88
Signed-off-by: Kees Cook <kees@kernel.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://patch.msgid.link/20241216224507.work.859-kees@kernel.org