[rubygems/rubygems] Use mkdir_p helper in bundler.rb

Small refactor, no functional change

rubygems/rubygems@5edb7a1026

lib/bundler.rb

@@ -100,9 +100,7 @@ def bundle_path
     end
 
     def create_bundle_path
-      SharedHelpers.filesystem_access(bundle_path.to_s) do |p|
-        mkdir_p(p)
-      end unless bundle_path.exist?
+      mkdir_p(bundle_path) unless bundle_path.exist?
 
       @bundle_path = bundle_path.realpath
     rescue Errno::EEXIST
@@ -119,7 +117,7 @@ def bin_path
       @bin_path ||= begin
         path = settings[:bin] || "bin"
         path = Pathname.new(path).expand_path(root).expand_path
-        SharedHelpers.filesystem_access(path) {|p| FileUtils.mkdir_p(p) }
+        mkdir_p(path)
         path
       end
     end
@@ -483,7 +481,7 @@ def use_system_gems?
       configured_bundle_path.use_system_gems?
     end
 
-    def mkdir_p(path, options = {})
+    def mkdir_p(path)
       SharedHelpers.filesystem_access(path, :write) do |p|
         FileUtils.mkdir_p(p)
       end