tests/9p: fix potential leak in v9fs_rreaddir()

Free allocated directory entries in v9fs_rreaddir() if argument
`entries` was passed as NULL, to avoid a memory leak. It is
explicitly allowed by design for `entries` to be NULL. [1]

[1] https://lore.kernel.org/all/1690923.g4PEXVpXuU@silver

Reported-by: Coverity (CID 1487558)
Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Message-Id: <E1psh5T-0002XN-1C@lizzy.crudebyte.com>
1 file changed