prevent use after move

src/db/plugins/upnp/Directory.cxx

@@ -192,7 +192,7 @@ protected:
 			if (tag_type == TAG_TITLE)
 				object.name = TitleToPathSegment(std::move(value));
 
-			value.clear();
+			value = {};
 			tag_type = TAG_NUM_OF_ITEM_TYPES;
 			return;
 		}

src/decoder/Control.cxx

@@ -170,5 +170,5 @@ void
 DecoderControl::CycleMixRamp() noexcept
 {
 	previous_mix_ramp = std::move(mix_ramp);
-	mix_ramp.Clear();
+	mix_ramp = {};
 }

src/playlist/cue/CueParser.cxx

@@ -171,7 +171,6 @@ CueParser::Commit() noexcept
 
 	finished = std::move(previous);
 	previous = std::move(current);
-	current.reset();
 }
 
 void
@@ -302,10 +301,7 @@ CueParser::Get() noexcept
 		assert(current == nullptr);
 
 		finished = std::move(previous);
-		previous.reset();
 	}
 
-	auto result = std::move(finished);
-	finished.reset();
-	return result;
+	return std::move(finished);
 }