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find_symbol_by_name() only returns the first match, so --debug-checksum=<func> silently ignores any subsequent duplicately named functions after the first. Fix that, along with a new for_each_sym_by_name() helper. Acked-by: Song Liu <song@kernel.org> Reviewed-by: Miroslav Benes <mbenes@suse.cz> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>