i3c: master: svc: fix returnvar.cocci warning

Fix the following coccicheck warning:

drivers/i3c/master/svc-i3c-master.c:1600:5-8:
Unneeded variable: "ret". Return "0" on line 1605.

Signed-off-by: Guo Zhengkui <guozhengkui@vivo.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20220504164901.9622-1-guozhengkui@vivo.com