* charset.c: Fix file descriptor leaks and errno issues.
Include <errno.h>. (load_charset_map_from_file): Don't leak file descriptor on error. Use plain record_xmalloc since the allocation is larger than MAX_ALLOCA; that's simpler here. Simplify test for exhaustion of entries. * eval.c (record_unwind_protect_nothing): * fileio.c (fclose_unwind): New functions. * lread.c (load_unwind): Remove. All uses replaced by fclose_unwind. The replacement doesn't block input, but that no longer seems necessary.
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