copy-file: Add missing free

[Simon Reinhardt]

Dear list,

q?copy_file_preserving is leaking a block, each time it is called with a
bogus filename:

#include <config.h>
#include <copy-file.h>

int
main (void)
{
  qcopy_file_preserving ("/tmp/some_non_existent_file", "/tmp/vlevle");
}

will produce in valgrind:

==5703== 32,768 bytes in 1 blocks are definitely lost in loss record 1 of 1
==5703==    at 0x4C28C20: malloc (vg_replace_malloc.c:296)
==5703==    by 0x402C0D: xmalloc (xmalloc.c:41)
==5703==    by 0x400EB4: qcopy_file_preserving (copy-file.c:61)
==5703==    by 0x400E88: main (copy-file.c:7)

Attached a fix that adds the missing call to free.

Thanks,
Simon

0001-copy-file-On-error-add-missing-call-to-free.patch
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