post-deinstall script, the variable intended to hold the name of that
script would be used uninitialized. In some cases, fexists() would
succeed, causing pkg_delete to try to chmod +x it, then execute it,
resulting in bizarre error messages such as:
.//: Permission denied
This bug would normally only occur when multiple packages were
specified on the command line; otherwise post_script would be located
in a previously unused part of the stack, and implicitly (but quite
accidentally) initialized to all-zeros.
MFC after: 3 days
8193b0d6a2