f2fs: start freeing cluster pages from the unused number

We can start freeing cluster page(s) from which compression
is not used. It will get better performance.
Signed-off-by: Zhang Qilong <zhangqilong3@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/compress.c

@@ -690,9 +690,7 @@ static int f2fs_compress_pages(struct compress_ctx *cc)
 	vm_unmap_ram(cc->cbuf, cc->nr_cpages);
 	vm_unmap_ram(cc->rbuf, cc->cluster_size);
 
-	for (i = 0; i < cc->nr_cpages; i++) {
-		if (i < new_nr_cpages)
-			continue;
+	for (i = new_nr_cpages; i < cc->nr_cpages; i++) {
 		f2fs_compress_free_page(cc->cpages[i]);
 		cc->cpages[i] = NULL;
 	}