[Fix] IMF: It was still possible that we were shifting by 64 bits.

git-svn-id: https://source.openmpt.org/svn/openmpt/trunk/OpenMPT@22229 56274372-70c3-4bfc-bfc3-4c3a0b034d27

soundlib/Load_imf.cpp

@@ -437,7 +437,7 @@ bool CSoundFile::ReadIMF(FileReader &file, ModLoadingFlags loadFlags)
 
 	// Read channel configuration
 	std::bitset<32> ignoreChannels;  // bit set for each channel that's completely disabled
-	uint64 channelMuteStatus = static_cast<uint64>(0xAAAA'AAAA) << (GetNumChannels() * 2);
+	uint64 channelMuteStatus = 0;
 	for(CHANNELINDEX chn = 0; chn < GetNumChannels(); chn++)
 	{
 		ChnSettings[chn].nPan = static_cast<uint16>(fileHeader.channels[chn].panning * 256 / 255);
@@ -459,7 +459,7 @@ bool CSoundFile::ReadIMF(FileReader &file, ModLoadingFlags loadFlags)
 	}
 	// BEHIND.IMF: All channels but the first are muted
 	// mikmod refers to this as an Orpheus bug, but I haven't seen any other files like this, so maybe it's just an incorrectly saved file?
-	if(channelMuteStatus == 0xAAAA'AAAA'5555'5554)
+	if(GetNumChannels() == 16 && channelMuteStatus == 0x5555'5554)
 	{
 		for(CHANNELINDEX chn = 1; chn < GetNumChannels(); chn++)
 			ChnSettings[chn].dwFlags.reset(CHN_MUTE);