Follow-up to r1544721: Make code VisualStudio's code anlysis happy

* subversion/libsvn_repos/hooks.c
  (svn_repos__parse_hooks_env): don't touch uninitialized variable

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1544723 13f79535-47bb-0310-9956-ffa450edef68
All our tests should use separate working sets.  This patch fixes
a bunch of C tests that used the same files / folders as other tests.
Most of them were probably the result of copy'n'paste.

* subversion/tests/libsvn_client/client-test.c
  (test_foreign_repos_copy): use test-specific working set

* subversion/tests/libsvn_fs_base/changes-test.c
  (changes_fetch_raw): ditto

* subversion/tests/libsvn_fs_base/strings-reps-test.c
  (write_null_string): ditto

* subversion/tests/libsvn_subr/translate-test.c
  (mixed_to_lf,
   unexpand_author,
   unexpand_date,
   unexpand_author_date,
   unexpand_author_rev,
   unexpand_rev,
   unexpand_rev_url,
   unexpand_author_date_rev_url,
   lf_to_crlf_unexpand_author,
   mixed_to_lf_unexpand_author_date,
   crlf_to_cr_unexpand_author_rev,
   cr_to_crlf_unexpand_rev,
   cr_to_crlf_unexpand_rev_url): ditto

* subversion/tests/libsvn_wc/op-depth-test.c
  (test_adds_change_kind,
   movedto_opdepth,
   del4_update_edit_AAA,
   del4_update_delete_AAA,
   del4_update_add_AAA,
   del4_update_delself_AAA): ditto

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1544726 13f79535-47bb-0310-9956-ffa450edef68