ncval: Fix --cpuid-all so that it sets all feature flags
ncval: Fix --cpuid-all so that it sets all feature flags

Fix mistake in use of "sizeof".

BUG=http://code.google.com/p/nativeclient/issues/detail?id=1526
TEST=manual: check that
  "ncval --cpuid-all scons-out/nacl-x86-64/staging/hello_world.nexe"
  does not list any CPU feature warnings or errors

Review URL: http://codereview.chromium.org/6677092

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@4553 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client