Return early from resolve_any_conflicts for non-symlinks

Library/Homebrew/keg.rb

@@ -325,12 +325,14 @@ class Keg
   private
 
   def resolve_any_conflicts dst, mode
+    return unless dst.symlink?
+
     src = dst.resolved_path
     # src itself may be a symlink, so check lstat to ensure we are dealing with
     # a directory, and not a symlink pointing at a directory (which needs to be
     # treated as a file). In other words, we only want to resolve one symlink.
     # If it isn't a directory, make_relative_symlink will raise an exception.
-    if dst.symlink? && src.lstat.directory?
+    if src.lstat.directory?
       keg = Keg.for(src)
       dst.unlink unless mode.dry_run
       keg.link_dir(src, mode) { :mkpath }