[bundler/bundler] Make sure gem has been built before deleteng it

https://github.com/bundler/bundler/commit/32520c7020

spec/bundler/quality_spec.rb

@@ -226,7 +226,6 @@ RSpec.describe "The library itself" do
 
   it "can still be built" do
     Dir.chdir(root) do
-      begin
       if ruby_core?
         spec = Gem::Specification.load(gemspec.to_s)
         spec.bindir = "libexec"
@@ -237,9 +236,12 @@ RSpec.describe "The library itself" do
         gem_command! :build, gemspec
       end
 
+      bundler_path = root.join("bundler-#{Bundler::VERSION}.gem")
+
+      begin
         expect(err).to be_empty, "bundler should build as a gem without warnings, but\n#{err}"
       ensure
-        root.join("bundler-#{Bundler::VERSION}.gem").rmtree
+        bundler_path.rmtree
       end
     end
   end