shmem: set variable shmem_mark_dquot_dirty and shmem_dquot_write_info storage-class-specifier to static

smatch reports
mm/shmem_quota.c:318:5: warning: symbol 'shmem_mark_dquot_dirty'
was not declared. Should it be static?
mm/shmem_quota.c:323:5: warning: symbol 'shmem_dquot_write_info'
was not declared. Should it be static?

These variables are only used in their defining file, so it should be static.

---
 mm/shmem_quota.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

index e349c0901bce..062d1c1097ae 100644
@@ -315,12 +315,12 @@ static int shmem_release_dquot(struct dquot *dquot)
 	return 0;
 }
 
-int shmem_mark_dquot_dirty(struct dquot *dquot)
+static int shmem_mark_dquot_dirty(struct dquot *dquot)
 {
 	return 0;
 }
 
-int shmem_dquot_write_info(struct super_block *sb, int type)
+static int shmem_dquot_write_info(struct super_block *sb, int type)
 {
 	return 0;
 }

2.27.0

These are functions, not variables, and you're the third person to send this patch today.