perf script: Use thread__find_symbol() instead of ad-hoc equivalent
In dc323ce8 ("perf script: Enable printing of branch stack") it first tries to find the map for an address, then the symbol in the DSO backing that map, for that address, well, this is what thread__find_symbol() does, so just use it and make the code shorter. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Stephane Eranian <eranian@google.com> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-03nx3aod955yqnf9l06im28j@git.kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
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