Just upgraded to Xcode 4.3.2 and found a new item in Preferences->Downloads called Command Line Tools.
So, if you click Update and get an error that says “<devaccount> does not have access to Command Line Tools”, it may be because you still have Xcode 4.2.x on your computer and the Xcode current folder path is pointing to that.
To remedy this, open Terminal.
If it prints /Developer, then you need to switch that to /Applications, which is where the new Xcode 4.3.x is installed. So, run the following and type in your password when prompted:
sudo /usr/bin/xcode-select -switch /Applications
After that, run Xcode again and you should be able to update Command Line Tools.
git commit --amend