src/dvbpsi.c: assert() on correct condition

The assert fired on the p_dvbpsi->p_private being NULL, while it should
have reacted on p_dvbpsi->p_private not being NULL. When the handle to
libdvbpsi (holding msg callback) is being deleted NO decoder maybe attached.

src/dvbpsi.c

@@ -161,7 +161,7 @@ dvbpsi_t *dvbpsi_NewHandle(dvbpsi_message_cb callback, enum dvbpsi_msg_level lev
  *****************************************************************************/
 void dvbpsi_DeleteHandle(dvbpsi_t *handle)
 {
-    assert(handle->p_private != NULL);
+    assert(handle->p_private == NULL);
     handle->pf_message = NULL;
     free(handle);
 }

src/tables/pat.c

@@ -102,7 +102,7 @@ void dvbpsi_DetachPAT(dvbpsi_t *p_dvbpsi)
     if (p_pat_decoder->p_current_section)
         dvbpsi_DeletePSISections(p_pat_decoder->p_current_section);
     free(p_pat_decoder);
-
+    p_dvbpsi->p_private = NULL;
 }