[Libguestfs] [PATCH nbdkit 2/2] server: Avoid modifying argv by saving keys in a list and freeing on exit.

[Richard W.M. Jones]

Unfortunately you cannot restore argv by setting *p = '=' :-(

The reason is we advertize that plugins are allowed to save they
‘const char *key’ pointer passed to them in .config, but assigning
*p = '=' changes the key string from "key" back to "key=value".

Surprisingly only test-eval.sh actually broke, but other plugins are
undoubtedly affected.

My alternate fix is fairly horrible, but passes all the tests and
valgrind.

Rich.