perf trace errors

[Christoph Hellwig]

I get some rather interesting errors using perf trace with the block
tracepoints on current mainline, e.g.:

perf record -f -e 'block:block_bio_queue:record' -R -F 1 -a -s
<do some disk I/O end then ctrl+c>
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.237 MB perf.data (~10362 samples) ]

brick:/home/hch# perf trace
  Fatal: unknown op '-'
          xfssyncd-4232  [000]    87.798249255: block_bio_queue: 253,

There are lots of occurances of that exactly same warning in
builtin-trace.c, and the code sourrouning them is sufficiently enough
convoluted that I'm not able to track it down.
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