rewrite penalty update

suggested by @terrelln

diff --git a/lib/compress/zstd_preSplit.c b/lib/compress/zstd_preSplit.c
index 02751a0d473a332f3ce60c97ebee639b58ece002..2e65f88d921fd3eafaba6aa8b4608d16dbc4f023 100644 (file)
--- a/lib/compress/zstd_preSplit.c
+++ b/lib/compress/zstd_preSplit.c
@@ -161,7 +161,7 @@ static size_t ZSTD_splitBlock_byChunks(const void* src, size_t srcSize,
             return pos;
         } else {
             mergeEvents(&fpstats->pastEvents, &fpstats->newEvents);
-            penalty = penalty - 1 + (penalty == 0);
+            if (penalty > 0) penalty--;
         }
     }
     assert(pos == blockSizeMax);