decavcodec: don't try to memset NULL buffers

libhb/decavcodec.c

@@ -532,7 +532,10 @@ static int decavcodecaWork( hb_work_object_t * w, hb_buffer_t ** buf_in,
     // libavcodec/mpeg12dec.c requires buffers to be zero padded.
     // If not zero padded, it can get stuck in an infinite loop.
     // It's likely there are other decoders that expect the same.
-    memset(in->data + in->size, 0, in->alloc - in->size);
+    if (in->data != NULL)
+    {
+        memset(in->data + in->size, 0, in->alloc - in->size);
+    }
 
     if (in->s.flags & HB_BUF_FLAG_EOF)
     {
@@ -1790,7 +1793,10 @@ static int decavcodecvWork( hb_work_object_t * w, hb_buffer_t ** buf_in,
     // libavcodec/mpeg12dec.c requires buffers to be zero padded.
     // If not zero padded, it can get stuck in an infinite loop.
     // It's likely there are other decoders that expect the same.
-    memset(in->data + in->size, 0, in->alloc - in->size);
+    if (in->data != NULL)
+    {
+        memset(in->data + in->size, 0, in->alloc - in->size);
+    }
 
     /* if we got an empty buffer signaling end-of-stream send it downstream */
     if (in->s.flags & HB_BUF_FLAG_EOF)