feeder: Fix mmap() arguments on x86_64.
feeder: Fix mmap() arguments on x86_64.

Apparently it doesn't go through the ugly indirection trick that i686 does.

Change-Id: I636c5e21f5840de82dac018bd212a1468aebbbbd

s-kanev/XIOSim,s-kanev/XIOSim,s-kanev/XIOSim,s-kanev/XIOSim