Remove debug statement.

(cherry picked from commit 1f9e1bacb65fe503ad23efba7f99ca6346fa648c)

Author: jelmer

lib/git/head.py

@@ -103,7 +103,6 @@ def from_string(cls, repo, line):
         Returns
             GitPython.Head
         """
-        print line
         full_name, ids = line.split("\x00")
         name = full_name.split("/")[-1]
         c = commit.Commit(repo, **{'id': ids})