DecoderThread: move code to DecoderControl::CycleMixRamp()

src/DecoderControl.cxx

@@ -144,8 +144,11 @@ decoder_control::MixRampEnd(char *_mixramp_end)
 }
 
 void
-decoder_control::MixRampPrevEnd(char *_mixramp_prev_end)
+decoder_control::CycleMixRamp()
 {
+	g_free(mixramp_start);
+	mixramp_start = nullptr;
 	g_free(mixramp_prev_end);
-	mixramp_prev_end = _mixramp_prev_end;
+	mixramp_prev_end = mixramp_end;
+	mixramp_end = nullptr;
 }

src/DecoderControl.hxx

@@ -364,7 +364,12 @@ public:
 
 	void MixRampStart(char *_mixramp_start);
 	void MixRampEnd(char *_mixramp_end);
-	void MixRampPrevEnd(char *_mixramp_prev_end);
+
+	/**
+	 * Move mixramp_end to mixramp_prev_end and clear
+	 * mixramp_start/mixramp_end.
+	 */
+	void CycleMixRamp();
 };
 
 #endif

src/DecoderThread.cxx

@@ -412,9 +412,7 @@ decoder_task(void *arg)
 
 		switch (dc.command) {
 		case DecoderCommand::START:
-			dc.MixRampStart(nullptr);
-			dc.MixRampPrevEnd(dc.mixramp_end);
-			dc.mixramp_end = nullptr; /* Don't free, it's copied above. */
+			dc.CycleMixRamp();
 			dc.replay_gain_prev_db = dc.replay_gain_db;
 			dc.replay_gain_db = 0;