implicit conversions

[sherifomran]

hi
there is implicit conversions from int64 to 32 at all chunk len points
line 660 QMidifile.cpp, please change similar lines to the following to avoid this warning
chunk_start = qint32(in.pos());

the warning does not appear with QT Creator but with Xcode. Please generate xcode project and compile with xcode to see it. Thank you