ext3 quota support: fix compile failure

ext3 quota support: fix compile failure

This one was due to a merge error: we added a use of nd.path in commit
0796e24627f1aa425f9d7f490206d13e810cfac4 ("ext3: add checks for errors
from jbd"), and concurrently we got rid of 'nd' and used a naked 'path'
in commit 7bc7747092a0afa2e5b45c5962a31c9fa7f92cd3 ("[PATCH] switch
quota_on-related stuff to kern_path()").

That all merged cleanly, but it didn't actually _work_.  This should fix
it.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>