The big NULL replacement party part 5.

Right. ' = NULL' would get a lot of these.

src/RageSoundReader_FileReader.h

@@ -34,7 +34,7 @@ public:
 	/* Open a file.  If pPrebuffer is non-NULL, and the file is sufficiently small,
 	 * the (possibly compressed) data will be loaded entirely into memory, and pPrebuffer
 	 * will be set to true. */
-	static RageSoundReader_FileReader *OpenFile( RString filename, RString &error, bool *pPrebuffer = NULL );
+	static RageSoundReader_FileReader *OpenFile( RString filename, RString &error, bool *pPrebuffer = nullptr );
 
 protected:
 	void SetError( RString sError ) const { m_sError = sError; }