perf trace: Check and discard not only 'nr' but also '__syscall_nr'
Format fields of a syscall have the first variable '__syscall_nr' or 'nr' that mean the syscall number. But it isn't relevant here so drop it. 'nr' among fields of syscall was renamed '__syscall_nr'. So add exception handling to drop '__syscall_nr' and modify the comment for this excpetion handling. Reported-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Taeung Song <treeze.taeung@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/r/1456492465-5946-1-git-send-email-treeze.taeung@gmail.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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