Fix brew unlink

Whoops.

Library/Homebrew/keg.rb

@@ -30,6 +30,7 @@ class Keg < Pathname
   def unlink
     n=0
     %w[bin etc lib include sbin share var].map{ |d| self/d }.each do |src|
+      src.find do |src|
         next if src == self
         dst=HOMEBREW_PREFIX+src.relative_path_from(self)
         next unless dst.symlink?
@@ -39,6 +40,7 @@ class Keg < Pathname
         n+=1
         Find.prune if src.directory?
       end
+    end
     linked_keg_record.unlink if linked_keg_record.exist?
     n
   end