[PATCH 1/3] powerpc/83xx: Fix build error when CONFIG_PCI=n

As reported by lkp:

  arch/powerpc/platforms/83xx/km83xx.c:183:19: error: 'mpc83xx_setup_pci' undeclared here (not in a function)
     183 |  .discover_phbs = mpc83xx_setup_pci,
	 |                   ^~~~~~~~~~~~~~~~~
	 |                   mpc83xx_setup_arch

There is a stub defined for the CONFIG_PCI=n case, but now that
mpc83xx_setup_pci() is being assigned to discover_phbs the correct
empty value is NULL.

Fixes: 83f84041ff1c ("powerpc/83xx: Move PHB discovery")
Reported-by: kernel test robot <redacted>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---
 arch/powerpc/platforms/83xx/mpc83xx.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/platforms/83xx/mpc83xx.h b/arch/powerpc/platforms/83xx/mpc83xx.h
index f37d04332fc7..a30d30588cf6 100644
--- a/arch/powerpc/platforms/83xx/mpc83xx.h
+++ b/arch/powerpc/platforms/83xx/mpc83xx.h

@@ -76,7 +76,7 @@ extern void mpc83xx_ipic_init_IRQ(void);
 #ifdef CONFIG_PCI
 extern void mpc83xx_setup_pci(void);
 #else
-#define mpc83xx_setup_pci()	do {} while (0)
+#define mpc83xx_setup_pci	NULL
 #endif
 
 extern int mpc83xx_declare_of_platform_devices(void);

-- 
2.25.1