trace-cmd: Do not let tracecmd_peek_data read past # of CPUs
trace-cmd: Do not let tracecmd_peek_data read past # of CPUs

tracecmd report --cpu #  will segfault if # is greater than the
last CPU defined in the trace.dat file. Prevent tracecmd_peek_data()
from reading past the last CPU.

Signed-off-by: Steven Rostedt <43232e92d70cc7aa53504ad0397085ee47bad87f@goodmis.org>

bigzz/trace-cmd,bigzz/trace-cmd