Fix a bug in svn_io_create_unique_link.  If the first attempt at creating the symlink failed, it would think all subsequent attempts also failed, resulting in a lot of symlinks.
Fix a bug in svn_io_create_unique_link.  If the first attempt at
creating the symlink failed, it would think all subsequent attempts
also failed, resulting in a lot of symlinks.

* subvesrion/libsvn_subr/io.c
  (svn_io_create_unique_link): Always check the return value from
    symlink before trying to get the system error.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion