Even though it shouldn't practically happen, better adding a trivial check,
just in case. The check is really cheap and possibly optimized-out.
| ../render/filter.c: In function ‘SetPicturePictFilter’:
| ../render/filter.c:388:36: warning: dereference of possibly-NULL ‘new_params’ [CWE-690] [-Wanalyzer-possible-null-dereference]
| 388 | pPicture->filter_params[i] = params[i];
| | ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~
Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>