[Media_api] Pm_OpenInput fails with pmBadPtr when no suitable input can be found

[jakob]

>From portmidi.c:Pm_OpenInput():

    /* arg checking */
    if (inputDevice < 0 || inputDevice >= pm_descriptor_index) 
        err = pmInvalidDeviceId;
    else if (!descriptors[inputDevice].pub.input) 
        err =  pmBadPtr;
    else if(descriptors[inputDevice].pub.opened)
        err =  pmBadPtr;
    
When no MIDI input device is connected, this results in pmBadPtr, which
is kinda confusing. Shouldn't it be pmInvalidDeviceId?
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