mm: make finish_mkwrite_fault() static

mainline inclusion
from mainline-v6.7-rc1
commit c08b7e3830dbf24dd2552ddeea84f00393842f1b
category: other
bugzilla: https://gitee.com/openeuler/kernel/issues/I8JQWQ

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c08b7e3830dbf24dd2552ddeea84f00393842f1b

--------------------------------

Make finish_mkwrite_fault static since it is not used outside of
memory.c.

Link: https://lkml.kernel.org/r/20231018140806.2783514-17-wangkefeng.wang@huawei.com


Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: ZhangPeng <zhangpeng362@huawei.com>