exfat: add error check when updating dir-entries

Add error check when synchronously updating dir-entries.

Suggested-by: Sungjong Seo <sj1557.seo@samsung.com>
Signed-off-by: Tetsuhiro Kohada <kohada.t2@gmail.com>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
diff --git a/fs/exfat/dir.c b/fs/exfat/dir.c
index 542f1a5..573659b 100644
--- a/fs/exfat/dir.c
+++ b/fs/exfat/dir.c
@@ -604,7 +604,7 @@ void exfat_update_dir_chksum_with_entry_set(struct exfat_entry_set_cache *es)
 	es->modified = true;
 }
 
-void exfat_free_dentry_set(struct exfat_entry_set_cache *es, int sync)
+int exfat_free_dentry_set(struct exfat_entry_set_cache *es, int sync)
 {
 	int i, err = 0;
 
@@ -617,6 +617,7 @@ void exfat_free_dentry_set(struct exfat_entry_set_cache *es, int sync)
 		else
 			brelse(es->bh[i]);
 	kfree(es);
+	return err;
 }
 
 static int exfat_walk_fat_chain(struct super_block *sb,