ec/quanta/ene_kb3940q/ec.c: Remove unuseful 'return' in void function

Change-Id: Ifb5f848912fca4e86b6eab16a74733571a4ba26d
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61483
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>

src/ec/quanta/ene_kb3940q/ec.c

@@ -103,7 +103,6 @@ void ec_mem_write(u8 addr, u8 data)
 	ec_write_cmd(EC_CMD_WRITE_RAM);
 	ec_write_ib(addr);
 	ec_write_ib(data);
-	return;
 }
 
 static void ene_kb3940q_log_events(void)