journal: fix reporting of output size in compres_stream_lz4

The header is 7 bytes, and this size was not accounted for in
total_out. This means that we could create a file that was 7 bytes
longer than requested, and the debug output was also inconsistent.

diff --git a/src/journal/compress.c b/src/journal/compress.c
index e1ab4a46f5518b83d37962fd2392835b10e32183..18281658942c3d0cc5a05a50d959a496be02c092 100644 (file)
--- a/src/journal/compress.c
+++ b/src/journal/compress.c
@@ -451,7 +451,7 @@ int compress_stream_lz4(int fdf, int fdt, uint64_t max_bytes) {
         _cleanup_(LZ4F_freeCompressionContextp) LZ4F_compressionContext_t ctx = NULL;
         _cleanup_free_ char *buf = NULL;
         char *src = NULL;
-        size_t size, n, total_in = 0, total_out = 0, offset = 0, frame_size;
+        size_t size, n, total_in = 0, total_out, offset = 0, frame_size;
         struct stat st;
         int r;
         static const LZ4F_compressOptions_t options = {
@@ -474,7 +474,7 @@ int compress_stream_lz4(int fdf, int fdt, uint64_t max_bytes) {
         if (!buf)
                 return -ENOMEM;
 
-        n = offset = LZ4F_compressBegin(ctx, buf, size, &preferences);
+        n = offset = total_out = LZ4F_compressBegin(ctx, buf, size, &preferences);
         if (LZ4F_isError(n))
                 return -EINVAL;