'snprintf()' guarantees null termination of buffer

Thanks @cremno.

src/alstream.cpp

@@ -236,7 +236,6 @@ void ALStream::openSource(const std::string &filename)
 		char buf[512];
 		snprintf(buf, sizeof(buf), "Unable to decode audio stream: %s.%s: %s",
 		         filename.c_str(), ext, e.msg.c_str());
-		buf[sizeof(buf)-1] = '\0';
 
 		Debug() << buf;
 	}

src/filesystem.cpp

@@ -611,7 +611,6 @@ static void fontSetEnumCB(void *data, const char *,
 
 	char filename[512];
 	snprintf(filename, sizeof(filename), "Fonts/%s", fname);
-	filename[sizeof(filename)-1] = '\0';
 
 	PHYSFS_File *handle = PHYSFS_openRead(filename);
 

src/settingsmenu.cpp

@@ -533,7 +533,6 @@ struct SettingsMenuPrivate
 		{
 			char buf[64];
 			snprintf(buf, sizeof(buf), "Press key or joystick button for \"%s\"", captureName);
-			buf[sizeof(buf)-1] = '\0';
 
 			drawOff = Vec2i();
 

src/soundemitter.cpp

@@ -213,7 +213,6 @@ SoundBuffer *SoundEmitter::allocateBuffer(const std::string &filename)
 			char buf[512];
 			snprintf(buf, sizeof(buf), "Unable to decode sound: %s.%s: %s",
 			         filename.c_str(), ext, Sound_GetError());
-			buf[sizeof(buf)-1] = '\0';
 			Debug() << buf;
 
 			return 0;