command-line processing memory leak

[Ben Pfaff]

I'm getting this from valgrind:

==3570== 12 bytes in 1 blocks are definitely lost in loss record 1 of 15
==3570==    at 0x4022AB8: malloc (vg_replace_malloc.c:207)
==3570==    by 0x4151DFD: malloc_allocate_node (llx.c:744)
==3570==    by 0x4151694: llx_insert (llx.c:113)
==3570==    by 0x41516EA: llx_push_tail (llx.c:80)
==3570==    by 0x804B72B: parse_io_opts (terminal-opts.c:114)
==3570==    by 0x497E315: group_parse (argp-parse.c:257)
==3570==    by 0x497EEA8: argp_parse (argp-parse.c:693)
==3570==    by 0x804BBC9: command_line_processor_parse (command-line.c:164)
==3570==    by 0x804A93C: main (main.c:128)

Memory leak?
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