When compile target i686 in platform x86_64, the stub function will
be called, and return zero.
Fixes: 12fa4a0078 ("hash: fix unsupported crc instruction in i686 platform")
Signed-off-by: Michael Qiu <michael.qiu@intel.com>
Acked-by: Thomas Monjalon <thomas.monjalon@6wind.com>