find-file-doc-comments.pl: don't look for a doc comment before the file starts
Related to #232
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@ -105,6 +105,9 @@ sub main {
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# back to it manually. Move to the first line that might be a doc comment.
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--$lineno;
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# If we ran off the beginning of the file, there's no doc comment.
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next if $lineno <= 0;
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# TODO make sure we're not still in the definition.
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# E.g., memblock.h:for_each_mem_range(). The defintion is reported
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# on the second line of the #define, not the first line.
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