hwrng: amd - Fix PCI device refcount leak

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: hwrng: amd - Fix PCI device refcount leak for_each_pci_dev() is implemented by pci_get_device(). The comment of pci_get_device() says that it will increase the reference count for the returned pci_dev and also decrease the reference count for the input pci_dev @from if it is not NULL. If we break for_each_pci_dev() loop with pdev not NULL, we need to call pci_dev_put() to decrease the reference count. Add the missing pci_dev_put() for the normal and error path.

References

• https://git.kernel.org/stable/c/f1c97f72ffd504f49882774e2ab689d982dc7afc
• https://git.kernel.org/stable/c/526c316948819d3ecd2bb20fe5e2580c51a1b760
• https://git.kernel.org/stable/c/e246f5eff26055bdcb61a2cc99c50af72a19680f
• https://git.kernel.org/stable/c/1199f8e02941b326c60ab71a63002b7c80e38212
• https://git.kernel.org/stable/c/5998e5c30e839f73e62cb29e0d9617b0d16ccba3
• https://git.kernel.org/stable/c/2b79a5e560779b35e1164d57ae35c48b43373082
• https://git.kernel.org/stable/c/cb348c7908631dd9f60083a0a1542eab055d3edf
• https://git.kernel.org/stable/c/2e10ecd012ae2b2a374b34f307e9bc1e6096c03d
• https://git.kernel.org/stable/c/ecadb5b0111ea19fc7c240bb25d424a94471eb7d