block/rnbd-clt-sysfs: fix a couple uninitialized variable bugs

block/rnbd-clt-sysfs: fix a couple uninitialized variable bugs

commit 7904022decc260a19dd65b56ac896387f5da6f8c upstream.

These variables are printed on the error path if match_int() fails so
they have to be initialized.

Fixes: 2958a995edc9 ("block/rnbd-clt: Support polling mode for IO latency optimization")
Fixes: 1eb54f8f5dd8 ("block/rnbd: client: sysfs interface functions")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Gioh Kim <gi-oh.kim@ionos.com>
Link: https://lore.kernel.org/r/20211012084443.GA31472@kili
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>