valgrind.supp fix for zstd

valgrind.patch

diff --git a/tests/valgrind.supp b/tests/valgrind.supp
index 10b07314a..4aaeac5b4 100644
--- a/tests/valgrind.supp
+++ b/tests/valgrind.supp
@@ -1,5 +1,13 @@
+{
+  zstd_decompression-1.3.3
+  Memcheck:cond
+  fun:ZSTD_decompressStream
+  obj:/usr/lib/x86_64-linux-gnu/libzstd.so.1.3.3
+  fun:zstd_unencode_write
+}
+
 {
    libidn-idna_to_ascii-error
    Memcheck:Addr4
    fun:idna_to_ascii_4z
    fun:idna_to_ascii_8z