project: fix format string in error message

BUG=None

Change-Id: I0b195fd919c6db8cb3547e8d6f4c733f2bd4a535
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/322735
Tested-by: LaMont Jones <lamontjones@google.com>
Reviewed-by: Xin Li <delphij@google.com>
diff --git a/project.py b/project.py
index 5b26b64..5922191 100644
--- a/project.py
+++ b/project.py
@@ -2440,7 +2440,7 @@
     if quiet:
       cmd.append('-q')
     if GitCommand(self, cmd).Wait() != 0:
-      raise GitError('%s submodule update --init --recursive %s ' % self.name)
+      raise GitError('%s submodule update --init --recursive ' % self.name)
 
   def _Rebase(self, upstream, onto=None):
     cmd = ['rebase']