obs-qsv11: Fix win7 crash when fake monitor isn't forced
When using QSV is used on a windows 7 machine with a dedicated card, you have to fake a monitor connection to your Intel graphics to be able to use QSV. If you do not, the initialization will fail with an error. The error for that situation is not handled properly, and a variable will be used while null. Instead, the function should safely return after that error is received. Also, do not call ClearData in the destructor unless QSV has been properly initialized (if m_pmfxENC is null).
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