perf evlist: Tolerate NULL maps in propagate_maps
Tolerating NULL maps in perf_evlist__propagate_maps, so we dont need to pass evlist with both cpus and threads maps defined. Signed-off-by: NJiri Olsa <jolsa@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1437481927-29538-10-git-send-email-jolsa@kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
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