memory leaks

[John Darrington]

The test suite seems to suddenly have got many many leaks of the form:

8 bytes in 1 blocks are definitely lost in loss record 1 of 5
   at 0x401C422: malloc (vg_replace_malloc.c:149)
   by 0x80E5FA1: xmalloc (xmalloc.c:49)
   by 0x80C5E21: create_case_source (case-source.c:34)
   by 0x80D736C: storage_sink_make_source (storage-stream.c:85)
   by 0x80D3BA0: internal_procedure (procedure.c:428)
   by 0x80D3F72: procedure (procedure.c:131)
   by 0x80C1FBC: sort_active_file_in_place (sort.c:75)
   by 0x8076DA9: cmd_sort_cases (sort-cases.c:71)
   by 0x804FA32: cmd_parse (command.c:186)
   by 0x804D697: main (main.c:137)


60 bytes in 1 blocks are definitely lost in loss record 2 of 5
   at 0x401C422: malloc (vg_replace_malloc.c:149)
   by 0x401D90C: realloc (vg_replace_malloc.c:306)
   by 0x80E5FD8: xrealloc (xmalloc.c:74)
   by 0x80DD109: trns_chain_append (transformations.c:135)
   by 0x80D308D: add_transformation (procedure.c:686)
   by 0x80A9A90: internal_cmd_print (print.c:214)
   by 0x804FA32: cmd_parse (command.c:186)
   by 0x804D697: main (main.c:137)


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