f2fs: remove unnecessary return value

Let's remove the unnecessary return value.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 72456ec..1f1bc58 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -773,13 +773,12 @@
 	spin_unlock(&sbi->stat_lock);
 }
 
-static inline int dec_valid_inode_count(struct f2fs_sb_info *sbi)
+static inline void dec_valid_inode_count(struct f2fs_sb_info *sbi)
 {
 	spin_lock(&sbi->stat_lock);
 	f2fs_bug_on(!sbi->total_valid_inode_count);
 	sbi->total_valid_inode_count--;
 	spin_unlock(&sbi->stat_lock);
-	return 0;
 }
 
 static inline unsigned int valid_inode_count(struct f2fs_sb_info *sbi)