Fix linked keg-only check when only directories are linked

Library/Homebrew/cmd/doctor.rb

@@ -913,38 +913,25 @@ def check_for_autoconf
 end
 
 def __check_linked_brew f
-  links_found = []
-
   prefix = f.prefix
 
   prefix.find do |src|
     next if src == prefix
     dst = HOMEBREW_PREFIX + src.relative_path_from(prefix)
-
+    return true if dst.symlink? && src == dst.resolved_path
-    next if !dst.symlink? || !dst.exist? || src != dst.resolved_path
-
-    if src.directory?
-      Find.prune
-    else
-      links_found << dst
-    end
   end
 
-  return links_found
+  false
 end
 
 def check_for_linked_keg_only_brews
   return unless HOMEBREW_CELLAR.exist?
 
-  warnings = Hash.new
+  linked = Formula.select { |f|
+    f.keg_only? && f.installed? && __check_linked_brew(f)
+  }
 
-  Formula.each do |f|
+  unless linked.empty?
-    next unless f.keg_only? and f.installed?
-    links = __check_linked_brew f
-    warnings[f.full_name] = links unless links.empty?
-  end
-
-  unless warnings.empty?
     s = <<-EOS.undent
     Some keg-only formula are linked into the Cellar.
     Linking a keg-only formula, such as gettext, into the cellar with
@@ -958,7 +945,7 @@ def check_for_linked_keg_only_brews
     You may wish to `brew unlink` these brews:
 
     EOS
-    warnings.each_key { |f| s << "    #{f}\n" }
+    linked.each { |f| s << "    #{f.full_name}\n" }
     s
   end
 end