net: dsa: rtl8366rb: remove unneeded semicolon

Eliminate the following coccicheck warning:
./drivers/net/dsa/rtl8366rb.c:1348:2-3: Unneeded semicolon

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>