'perf version' on powerpc segfaults when used with non-supported
option:
  # perf version -a
  Segmentation fault (core dumped)

Fix this.
Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Reviewed-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Tested-by: Mamatha Inamdar <mamatha4@linux.vnet.ibm.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/20190611030109.20228-1-ravi.bangoria@linux.ibm.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>