maxtime is of type int, so fix comparison to use 0 not 0.0f

Author: Konstanty

src/modplug.cpp

@@ -259,7 +259,7 @@ void ModPlug_Seek(ModPlugFile* file, int millisecond)
 millisecond = maxtime;
 maxpos = file->mSoundFile.GetMaxPosition();
 postime = 0.0f;
-if (maxtime != 0.0f)
+if (maxtime != 0)
 postime = (float)maxpos / (float)maxtime;
 
 file->mSoundFile.SetCurrentPos((int)(millisecond * postime));