Fix resolving svn revisions in release scripts.

tools/push-to-trunk/git_recipes.py

Index: tools/push-to-trunk/git_recipes.py
diff --git a/tools/push-to-trunk/git_recipes.py b/tools/push-to-trunk/git_recipes.py
index 456156f7094983cae4b1d42d31ed08861e44c63b..a1e6256df29db1b26e7ea5676f584c72700e39d5 100644
--- a/tools/push-to-trunk/git_recipes.py
+++ b/tools/push-to-trunk/git_recipes.py
@@ -295,8 +295,11 @@ class GitRecipesMixin(object):
   @Strip
   def GitSVNFindGitHash(self, revision, branch="", **kwargs):
     assert revision
-    return self.Git(
-        MakeArgs(["svn find-rev", "r%s" % revision, branch]), **kwargs)
+    args = MakeArgs(["svn find-rev", "r%s" % revision, branch])
+
+    # Pick the last line if multiple lines are available. The first lines might
+    # print information about rebuilding the svn-git mapping.
+    return self.Git(args, **kwargs).splitlines()[-1]
 
   @Strip
   def GitSVNFindSVNRev(self, git_hash, branch="", **kwargs):