Build failure with fsl_msi.c

[Benjamin Herrenschmidt]

The ppc64e_defconfig gives me that:

No big deal since nothing currently uses Book3E HW with fsl_msi but
probably something you should fix.

cc1: warnings being treated as errors
/home/benh/linux-powerpc-test/arch/powerpc/sysdev/fsl_msi.c: In function ‘fsl_msi_cascade’:
/home/benh/linux-powerpc-test/arch/powerpc/sysdev/fsl_msi.c:189: error: cast from pointer to integer of different size
  LDS     arch/powerpc/kernel/vdso32/vdso32.lds
/home/benh/linux-powerpc-test/arch/powerpc/sysdev/fsl_msi.c: In function ‘fsl_of_msi_probe’:
/home/benh/linux-powerpc-test/arch/powerpc/sysdev/fsl_msi.c:307: error: cast to pointer from integer of different size
make[2]: *** [arch/powerpc/sysdev/fsl_msi.o] Error 1

Cheers,
Ben.