f2fs: simplify code in f2fs_prepare_decomp_mem

It could return directly after init_decompress_ctx.
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/compress.c

@@ -1568,12 +1568,8 @@ static int f2fs_prepare_decomp_mem(struct decompress_io_ctx *dic,
 	if (!dic->cbuf)
 		return -ENOMEM;
 
-	if (cops->init_decompress_ctx) {
-		int ret = cops->init_decompress_ctx(dic);
-
-		if (ret)
-			return ret;
-	}
+	if (cops->init_decompress_ctx)
+		return cops->init_decompress_ctx(dic);
 
 	return 0;
 }