Make retry condition more defensive not to loop infinitely

Author: nobu

lib/rdoc/generator/darkfish.rb

@@ -722,7 +722,7 @@ def excerpt(comment)
       first_paragraph_match = text.match(pattern)
     rescue Encoding::CompatibilityError
       # The doc is non-ASCII text and encoded in other than Unicode base encodings.
-      raise unless pattern.eaual?(ParagraphExcerptRegexpUnicode)
+      raise if pattern == ParagraphExcerptRegexpOther
       pattern = ParagraphExcerptRegexpOther
       retry
     end