In the ARM environment, using pci-ohci with specific OS (CentOS-8-aarch64-1905-dvd1.iso) to start a virtual machine, will cause the memory leak
Description of problem:

Steps to reproduce:
1.Using the pci-ohci as the USB controller to start the VM;

2.install the OS using the CentOS-8-aarch64-1905-dvd1.iso ;

3.The QEMU process is taking up more and more memory, which looks like Memory leak
Additional information:
![bugreport](/uploads/63af75a469be21e7ce734a22a3dcf33c/bugreport.PNG)