segfault when applying patch

Hi,

A few crash dumps sent for TSVN 1.7 show a segfault when applying a patch.

in libsvn_client/patch.c, line 2703:

target_info = APR_ARRAY_IDX(targets_info, i, patch_target_info_t *);
parent = svn_dirent_dirname(target_info->local_abspath, iterpool);

the target_info->local_abspath is NULL, so svn_dirent_dirname() then
segfaults.

I haven't figured out why target_info->local_abspath is NULL though, but
maybe you have an idea?

Stefan

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