Return early so we can reduce nesting of conditionals

Library/Homebrew/extend/pathname.rb

@@ -291,11 +291,13 @@ class Pathname
   # perhaps confusingly, this Pathname object becomes the symlink pointing to
   # the src paramter.
   def make_relative_symlink src
-    self.dirname.mkpath
-    Dir.chdir self.dirname do
+    dirname.mkpath
+
+    dirname.cd do
       # NOTE only system ln -s will create RELATIVE symlinks
-      quiet_system 'ln', '-s', src.relative_path_from(self.dirname), self.basename
-      if not $?.success?
+      return if quiet_system("ln", "-s", src.relative_path_from(dirname), basename)
+    end
+
     if symlink? && exist?
       raise <<-EOS.undent
         Could not symlink file: #{src}
@@ -334,8 +336,6 @@ class Pathname
         EOS
     end
   end
-    end
-  end
 
   def / that
     join that.to_s