add_handle and malloc

["Conrad Scott" <Conrad dot Scott at dsl dot pipex dot com>]

The add_handle in "debug.cc" code still malloc's entries once the
free list is exhausted, which doesn't work very well on fork now
that the entries are (otherwise) in cygheap.  I've attached a
patch that gets rid of the malloc, so once the free list is
exhausted, new handles simply aren't added to the list.

Isn't it always the way: you write a test program for one thing
and you find something else entirely.  My real problem is that
something's leaking handles, so now it's back to that original
issue.

Cheers,

// Conrad

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Attachment: debug.patch.txt
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