Set bitmap size when allocating a bitmap
I began noticing a race when reserving VNC ports as described here https://www.redhat.com/archives/libvir-list/2010-November/msg00379.html Turns out that we were not initializing the size field of bitmap struct when allocating the bitmap. This subsequently caused virBitmapSetBit() to fail since bitmap->size is 0, hence we never actually reserved the port.
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