xz: Add a clarifying assertion

Fixes: 5f0c5a04388f8334962c70bc37a8c2ff8f605e0a
(cherry picked from commit 1eaad004bf7748976324672db028e34f42802e61)

diff --git a/src/xz/coder.c b/src/xz/coder.c
index f3e9093ba6eb1390381cb9d278d9b953b7768975..61054c39c942246ef9d8929a1317b3e9cac2e0a5 100644 (file)
--- a/src/xz/coder.c
+++ b/src/xz/coder.c
@@ -256,6 +256,7 @@ filters_memusage_max(uint64_t *filter_memusages,
                uint64_t memusage = UINT64_MAX;
 #ifdef MYTHREAD_ENABLED
                if (mt != NULL) {
+                       assert(encode);
                        mt_local.filters = filters[i];
                        memusage = lzma_stream_encoder_mt_memusage(&mt_local);
                } else