perf symbols: Return the first entry with a given name in find_by_name method
When a dso contains multiple symbols which have same name, current dso__find_symbol_by_name() only finds an one of them and there's no way to get the all symbols without going through the rbtree. So make symbols__find_by_name() return the first entry with the given name and the next patch in this series will provide a way to iterate from there, by the name ordered rb_tree, till a suitable symbol is found. Signed-off-by: NNamhyung Kim <namhyung@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Link: http://lkml.kernel.org/r/1421234288-22758-2-git-send-email-namhyung@kernel.org [ Yanked this independent hunk, without changes, from a larger patch ] Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
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