perf dso: Export data_file_size() method there are no symbols
Will be used outside dso.c in a followup patch, so rename it and make it non-static. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Link: http://lkml.kernel.org/r/20181127084634.12469-1-adrian.hunter@intel.com [ split from a larger patch ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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