f2fs: replace logical value "true" with a int number

The "true" is not match the parametera type "int", and
we modify it.
Signed-off-by: Zhang Qilong <zhangqilong3@huawei.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/segment.c

@@ -481,7 +481,7 @@ void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi, bool from_bg)
 
 		mutex_unlock(&sbi->flush_lock);
 	}
-	f2fs_sync_fs(sbi->sb, true);
+	f2fs_sync_fs(sbi->sb, 1);
 	stat_inc_bg_cp_count(sbi->stat_info);
 }