perf thread: Allow deletion of a thread with no map groups
It needs to be possible to call thread__delete() on a thread with no map groups. This is needed for a subsequent patch which deletes a thread on the error path before map groups have been attached. Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1405495184-20441-2-git-send-email-adrian.hunter@intel.comSigned-off-by: NAdrian Hunter <adrian.hunter@intel.com> Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
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