v4.4.241 build failures

[Guenter Roeck <linux@xxxxxxxxxxxx>]

Building powerpc:defconfig ... failed
--------------
Error log:
arch/powerpc/platforms/powernv/opal-dump.c: In function ‘process_dump’:
arch/powerpc/platforms/powernv/opal-dump.c:409:7: error: void value not ignored as it ought to be
  dump = create_dump_obj(dump_id, dump_size, dump_type);