dpll: Fix potential msg memleak when genlmsg_put_reply failed

We should clean the skb resource if genlmsg_put_reply failed.

Fixes: 9d71b54b ("dpll: netlink: Add DPLL framework base functions")
Signed-off-by: Hao Ge <gehao@kylinos.cn>
Reviewed-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Link: https://lore.kernel.org/r/20231121013709.73323-1-gehao@kylinos.cn


Signed-off-by: Jakub Kicinski <kuba@kernel.org>