git warning about whitespace?

[Bruno Haible]

Hi,

Just saw this while performing a git operation:

  $ git rebase origin/master
  First, rewinding head to replay your work on top of it...
  Applying Propagate effects of putenv/setenv/unsetenv to child processes.
  Applying A new test for posix_spawn.
  .dotest/patch:309: trailing whitespace.
  }  
  .dotest/patch:496: trailing whitespace.
  }  
  warning: 2 lines add whitespace errors.

Is git now warning about coding style?! Where is this configured? And
what's the meaning of the closing braces below the nonexistent filenames?

Bruno