Commit 51bfc480 for libheif

commit 51bfc48082abcca4615a95aad2b1fc79d75e6d96
Author: Dirk Farin <dirk.farin@gmail.com>
Date:   Sun Apr 12 21:52:22 2026 +0200

    avoid decrementing zero value

diff --git a/libheif/bitstream.cc b/libheif/bitstream.cc
index 4393c059..cf760e2f 100644
--- a/libheif/bitstream.cc
+++ b/libheif/bitstream.cc
@@ -652,7 +652,8 @@ int BitReader::peek_bits(int n)
 void BitReader::skip_bytes(uint32_t nBytes)
 {
   // TODO: this is slow
-  while (nBytes--) {
+  while (nBytes) {
+    nBytes--;
     skip_bits(8);
   }
 }