4xx_pci.c: add error checking, fix GCC 4.6 build warning

Fix:
4xx_pci.c: In function 'pci_init_board':
4xx_pci.c:855:6: warning: variable 'busno' set but not used
[-Wunused-but-set-variable]

Signed-off-by: Wolfgang Denk <wd@denx.de>
Cc: Stefan Roese <sr@denx.de>
Acked-by: Stefan Roese <sr@denx.de>
1 file changed