x86/pci: Return true/false (not 1/0) from bool functions

x86/pci: Return true/false (not 1/0) from bool functions

Return boolean values ("true" or "false") instead of 1 or 0 from bool
functions.  This fixes the following warnings from coccicheck:

  ./arch/x86/pci/mmconfig-shared.c:464:9-10: WARNING: return of 0/1 in function 'is_mmconf_reserved' with return type bool
  ./arch/x86/pci/mmconfig-shared.c:493:5-6: WARNING: return of 0/1 in function 'is_mmconf_reserved' with return type bool
  ./arch/x86/pci/mmconfig-shared.c:501:9-10: WARNING: return of 0/1 in function 'is_mmconf_reserved' with return type bool
  ./arch/x86/pci/mmconfig-shared.c:522:5-6: WARNING: return of 0/1 in function 'is_mmconf_reserved' with return type bool

Link: https://lore.kernel.org/r/1615794000-102771-1-git-send-email-yang.lee@linux.alibaba.com
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Krzysztof Wilczyński <kw@linux.com>