Merge pull request #3290 from felixhandte/ddict-dict-id-from-ddict

Make ZSTD_getDictID_fromDDict() Read DictID from DDict

lib/decompress/zstd_ddict.c

@@ -240,5 +240,5 @@ size_t ZSTD_sizeof_DDict(const ZSTD_DDict* ddict)
 unsigned ZSTD_getDictID_fromDDict(const ZSTD_DDict* ddict)
 {
     if (ddict==NULL) return 0;
-    return ZSTD_getDictID_fromDict(ddict->dictContent, ddict->dictSize);
+    return ddict->dictID;
 }