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x11: fix VOCTRL_GET_WIN_STATE
Do not rely on the pointed-to argument to be initialized; VOCTRLs are supposed to completely overwrite them on success (or not to touch them on failure). The currently only caller of VOCTRL_GET_WIN_STATE initializes the value before calling this, so this is merely about correctness and didn't lead to any actual bugs.
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@ -1675,6 +1675,7 @@ int vo_x11_control(struct vo *vo, int *events, int request, void *arg)
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case VOCTRL_GET_WIN_STATE: {
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if (!x11->pseudo_mapped)
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return VO_FALSE;
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*(int *)arg = 0;
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int num_elems;
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long *elems = x11_get_property(x11, x11->window, XA(x11, _NET_WM_STATE),
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XA_ATOM, 32, &num_elems);
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