* lread.c: Fix file descriptor leaks and errno issues.
(Fload): Close some races that leaked fds or streams when 'load' was interrupted. (Fload, openp): Report error number of last nontrivial failure to open. ENOENT counts as trivial. * eval.c (do_nothing, clear_unwind_protect, set_unwind_protect_ptr): New functions. * fileio.c (close_file_unwind): No need to test whether FD is nonnegative, now that the function is always called with a nonnegative arg. * lisp.h (set_unwind_protect_ptr, set_unwind_protect_int): Remove. All uses replaced with ... (clear_unwind_protect, set_unwind_protect_ptr): New decls.
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