[PATCH] erofs-utils: add clusterofs zero check to write_uncompressed_extent()

[Yue Hu]

From: Yue Hu <huyue2 at yulong.com>

No need to reset clusterofs to 0 if it's already 0. Acturally, we also
observed that case frequently. Let's avoid it.

Signed-off-by: Yue Hu <huyue2 at yulong.com>
---
 lib/compress.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/compress.c b/lib/compress.c
index 40723a1..a8ebbc1 100644
--- a/lib/compress.c
+++ b/lib/compress.c
@@ -130,7 +130,7 @@ static int write_uncompressed_extent(struct z_erofs_vle_compress_ctx *ctx,
 	unsigned int count;
 
 	/* reset clusterofs to 0 if permitted */
-	if (!erofs_sb_has_lz4_0padding() &&
+	if (!erofs_sb_has_lz4_0padding() && ctx->clusterofs &&
 	    ctx->head >= ctx->clusterofs) {
 		ctx->head -= ctx->clusterofs;
 		*len += ctx->clusterofs;
-- 
1.9.1