perf, x86: P4 PMU -- Use perf_sample_data_init helper

Instead of opencoded assignments better to use
perf_sample_data_init helper.

Tested-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Don Zickus <dzickus@redhat.com>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Link: http://lkml.kernel.org/r/1303398203-2918-2-git-send-email-dzickus@redhat.com


Signed-off-by: Ingo Molnar <mingo@elte.hu>