fixed importFilter::readByte() to return proper integer instead of signed char - makes import-filters finally work

git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@742 0778d3d1-df1d-0410-868b-ea421aaaa00d

ChangeLog

@@ -1,5 +1,9 @@
 2008-02-29	Tobias Doerffel	<tobydox/at/users/dot/sourceforge/dot/net>
 
+	* include/import_filter.h:
+	fixed importFilter::readByte() to return proper integer instead of
+	signed char - makes import-filters finally work
+
 	* plugins/midi_import/midi_import.cpp:
 	* plugins/flp_import/flp_import.cpp:
 	fixed parameter-list of lmms_plugin_main to work properly

include/import_filter.h

@@ -67,8 +67,8 @@ protected:
 
 	inline int readByte( void )
 	{
-		char c;
-		if( m_file.getChar( &c ) )
+		unsigned char c;
+		if( m_file.getChar( (char*) &c ) )
 		{
 			return( static_cast<int>( c ) );
 		}