perf session: Fix crash with invalid CPU list
commit 5d67be97 added the option to specify a range of CPUs of interest, but does not catch an invalid CPU list: $ perf script -c foo Segmentation fault (core dumped) Cc: Anton Blanchard <anton@samba.org> Link: http://lkml.kernel.org/r/1321206327-5881-1-git-send-email-dsahern@gmail.comSigned-off-by: NDavid Ahern <dsahern@gmail.com> Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
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