CID 1508976: Uninitialized scalar variable

[maskit]

386  if (ts_lua_hex_to_bin(key_bin, key, klen) == NULL) {
387    TSfree(key_bin);
388    return luaL_error(L, "hex to binary conversion failed");
389  }
390  key_bin_len = klen / 2;
391
392  HMAC(EVP_sha1(), key_bin, key_bin_len, src, slen, sha_buf, &output_length);
393
   	
CID 1508976 (#1 of 1): Uninitialized scalar variable (UNINIT)
9. uninit_use_in_call: Using uninitialized element of array sha_buf when calling ts_lua_hex_dump. [[show details](https://scan6.scan.coverity.com/eventId=34625621-13&modelId=34625621-0&fileInstanceId=162996654&filePath=%2Fplugins%2Flua%2Fts_lua_string.c&fileStart=23&fileEnd=33)]
394  ts_lua_hex_dump(hex_buf, sha_buf, sizeof(sha_buf));
395  lua_pushlstring(L, (char *)hex_buf, sizeof(hex_buf));
396
397  TSfree(key_bin);
398  return 1;
399}