[BUG] perf report: bogus event group name reported

[Stephane Eranian]

Hi,

Testing event group in sampling mode and finding
issues on the reporting side:

$ perf record --group -e 'grp1{cycles,instructions}' noploop 1
$ perf report --group  --stdio
...
# group: M^B{cycles,instructions}
             ^^^^ broken group name

# ========
#
# Samples: 8K of event '[binfmt_misc] { cycles, instructions }'
                                   ^^^^^^^^^^^^^^ broken event group name

# Event count (approx.): 7024115127
#
#         Overhead  Command      Shared Object                       Symbol
# ................  .......  .................  ...........................
#
    99.96%  99.97%  noploop  noploop            [.] main
     0.03%   0.03%  noploop  [kernel.kallsyms]  [k] apic_timer_interrupt
     0.01%   0.01%  noploop  [kernel.kallsyms]  [k] find_get_page
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