Description: Fix FTBFS against GCC-11
 Obviously this is a bug. The GTK documentation for g_list_find says it
 returns the found GList element or NULL if not found.
Index: nted/voice.cpp
===================================================================
--- nted.orig/voice.cpp
+++ nted/voice.cpp
@@ -1363,7 +1363,7 @@ bool NedVoice::tryConvertToTuplet(int me
 		return FALSE;
 	}
 	ref_duration = (method == 1) ? templ->getDuration() / 2 : templ->getDuration();
-	if ((min_pos_ptr = g_list_find(m_chord_or_rests, templ)) < 0) {
+	if ((min_pos_ptr = g_list_find(m_chord_or_rests, templ)) == NULL) {
 		NedResource::Abort("NedVoice::tryConvertToTuplet(1)");
 	}
 	if ((minpos = g_list_index(m_chord_or_rests, templ)) < 0) {