This redefinition generates warnings on some clang compilers and older
gcc4.4.

...include/hw/ppc/pnv_xscom.h:24:24: warning: redefinition of typedef 'PnvChip' is a C11
      feature [-Wtypedef-redefinition]
typedef struct PnvChip PnvChip;
                       ^
...include/hw/ppc/pnv.h:65:3: note: previous definition is here
} PnvChip;
  ^
1 warning generated.
  CC      ppc64-softmmu/hw/ppc/pnv_xscom.o
Signed-off-by: NCédric Le Goater <clg@kaod.org>
Reviewed-by: NThomas Huth <thuth@redhat.com>
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>