Replace SVN_ERR_ASSERT in write_entry with an error that includes the
path in the working copy.  These asserts are still being reported and
they are hard to debug because there is no indication of which bit of
the working copy is causing the problem.

* subversion/libsvn_wc/entries.c
  (WRITE_ENTRY_ASSERT): New.
  (write_entry): Replace SVN_ERR_ASSERT.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1458235 13f79535-47bb-0310-9956-ffa450edef68