[geary] Object being passed for string in printf-style statement

[Jim Nelson <jnelson src gnome org>]

commit 1f6528b695b6754a710cff92c72e1b10e50e40b1
Author: Jim Nelson <jim yorba org>
Date:   Tue Jul 8 15:39:12 2014 -0700

    Object being passed for string in printf-style statement
    
    Newest version of Vala apparently catches this (older versions
    compiled w/o complaint).  Caught by GNOME Continuous.

 src/engine/imap/api/imap-account.vala |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/src/engine/imap/api/imap-account.vala b/src/engine/imap/api/imap-account.vala
index 6be8706..2bff719 100644
--- a/src/engine/imap/api/imap-account.vala
+++ b/src/engine/imap/api/imap-account.vala
@@ -273,8 +273,10 @@ private class Geary.Imap.Account : BaseObject {
         MailboxInformation? mailbox_info = path_to_mailbox.get(path);
         if (mailbox_info == null)
             throw_not_found(path);
-        if (mailbox_info.attrs.is_no_select)
-            throw new EngineError.UNSUPPORTED("Can't fetch unseen count for unselectable folder %s", path);
+        if (mailbox_info.attrs.is_no_select) {
+            throw new EngineError.UNSUPPORTED("Can't fetch unseen count for unselectable folder %s",
+                path.to_string());
+        }
         
         StatusData data = yield fetch_status_async(path, { StatusDataType.UNSEEN }, cancellable);
         return data.unseen;