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When looping through all PCI functions, code should not look for functions 1-7 if function 0 is not present or if function 0 indicates the device is not multifunction. Prior to this fix the code would use stale data in a buffer to determine if a device is multifunction even if function 0 is not present. This fixes a code bug and provides very small performance improvements. PCI 2.3 Specification states: They [multifunction devices] are also required to always implement function 0 in the device. Implementing other functions is optional and may be assigned in any order. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Joseph Shifflett <joseph.shifflett@hpe.com> Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18574 6f19259b-4bc3-4df7-8a09-765794883524