port a49a2bbc138b34080f36ad3d091e57db6bb0e7ba from Pd-l2ork: fixed segfault...

port a49a2bbc138b34080f36ad3d091e57db6bb0e7ba from Pd-l2ork: fixed segfault caused by the latest commit. Now everything should work including the RPi3.

l2ork_addons/raspberry_pi/disis_spi/disis_spi.c

@@ -164,7 +164,7 @@ static int disis_spi_write_read(t_disis_spi *spi, unsigned char *data, int lengt
  
   for (i = 0 ; i < length ; i++){
  
-    memset(&spi[i], 0, sizeof (spi[i])); 
+    memset(&spid[i], 0, sizeof (spid[i])); 
     spid[i].tx_buf        = (unsigned long)(data + i); // transmit from "data"
     spid[i].rx_buf        = (unsigned long)(data + i); // receive into "data"
     spid[i].len           = sizeof(*(data + i));