The header files bbpos.h is included twice in backpointers.c,
so one inclusion of each can be removed.
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=10783 Signed-off-by: Yang Li <yang.lee@linux.alibaba.com> Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>