Initialize variable

Initialize variable last_i with 0 - it indicates the line number, from which the transmission may be restarted if needed.

lpc.c

@@ -116,6 +116,7 @@ void lpc_write_ram(struct lpc_device *dev, const struct sprog_data *d, unsigned
   lpc_command("W %u %u\r\n", addr, d->size);
   sprog_error("Writing %d bytes\n", d->size);
   
+  last_i = 0;
   last_offset = 0;
   offset = 0;
   sprog_progress((offset*100)/d->size);