Btrfs: return -1 when lzo compression makes data bigger

With this fix the lzo code behaves like the zlib code by returning an error code when compression does not help reduce the size of the file. This is currently not a bug since the compressed size is checked again in the calling method compress_file_range.

---
 fs/btrfs/lzo.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

index f93151a..b6a6f07 100644
@@ -207,8 +207,10 @@ static int lzo_compress_pages(struct list_head *ws,
 		}
 
 		/* we're making it bigger, give up */
-		if (tot_in > 8192 && tot_in < tot_out)
+		if (tot_in > 8192 && tot_in < tot_out) {
+			ret = -1;
 			goto out;
+		}
 
 		/* we're all done */
 		if (tot_in >= len)

1.8.3.1