pci: insert assert that auto-assigned-address function is single function device.
Auto-assigned-address pci function (passing devfn = -1) is always single function. This patch adds assert() to guarantee that auto-assigned-address function is always single function device at function = 0. Signed-off-by: NIsaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>
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