perf annotate: Check null of sym pointer before using it
Sym may be NULL, and that will cause perf to crash. Signed-off-by: NShan Wei <davidshan@tencent.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Namhyung Kim <namhyung.kim@lge.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/4FCD95D3.90209@gmail.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
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