Fix Nspire device information response length

nsp_cmd_r_dev_infos validates the size output pointer but never assigns
to it. get_version then uses an uninitialized length when copying the
product name, which can truncate "TI-Nspire CX CAS" to "TI".

Return the received payload size alongside the command and data,
consistent with nsp_cmd_r_screen_rle.

Author: myyra

libticalcs/trunk/src/nsp_cmd.cc

@@ -205,6 +205,7 @@ int TICALL nsp_cmd_r_dev_infos(CalcHandle *handle, uint8_t *cmd, uint32_t *size,
 	if (!retval)
 	{
 		*cmd = pkt->cmd;
+		*size = pkt->size;
 		*data = (uint8_t *)g_malloc0(pkt->size);
 		if (NULL != *data)
 		{