Fix segfault on exit

Signed-off-by: Mahyar Koshkouei <deltabeard@users.noreply.github.com>

source/main.c

@@ -129,7 +129,7 @@ int main(int argc, char **argv)
 			if(kDown & KEY_B)
 			{
 				stopPlayback();
-				changeFile(NULL, NULL);
+				changeFile(NULL, &playbackInfo);
 				consoleSelect(&topScreen);
 				puts("Stopped");
 				continue;
@@ -238,8 +238,8 @@ int main(int argc, char **argv)
 out:
 	puts("Exiting...");
 	runThreads = false;
-	stopPlayback();
-	changeFile(NULL, NULL);
+	svcSignalEvent(playbackFailEvent);
+	changeFile(NULL, &playbackInfo);
 
 	gfxExit();
 	sdmcExit();

source/playback.c

@@ -13,7 +13,9 @@
 static volatile bool stop = false;
 
 /**
- * Should only be called from a new thread only.
+ * Should only be called from a new thread only, and have only one playback
+ * thread at time. This function has not been written for more than one
+ * playback thread in mind.
  */
 void playFile(void* infoIn)
 {