hid: fix I2C read buffer overflow in raw_event() for mcp2221

As reported by syzbot, mcp2221_raw_event lacked
validation of incoming I2C read data sizes, risking buffer
overflows in mcp->rxbuf during multi-part transfers.
As highlighted in the DS20005565B spec, p44, we have:
"The number of read-back data bytes to follow in this packet:
from 0 to a maximum of 60 bytes of read-back bytes."
This patch enforces we don't exceed this limit.

Reported-by:  <syzbot+52c1a7d3e5b361ccd346@syzkaller.appspotmail.com>
Closes: https://syzkaller.appspot.com/bug?extid=52c1a7d3e5b361ccd346


Tested-by:  <syzbot+52c1a7d3e5b361ccd346@syzkaller.appspotmail.com>
Signed-off-by: Arnaud Lecomte <contact@arnaud-lcm.com>
Link: https://patch.msgid.link/20250726220931.7126-1-contact@arnaud-lcm.com


Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>