soc: aspeed: lpc-snoop: Cleanup resources in stack-order

Free the kfifo after unregistering the miscdev in
aspeed_lpc_disable_snoop() as the kfifo is initialised before the
miscdev in aspeed_lpc_enable_snoop().

Fixes: 3772e5da ("drivers/misc: Aspeed LPC snoop output using misc chardev")
Cc: stable@vger.kernel.org
Cc: Jean Delvare <jdelvare@suse.de>
Acked-by: Jean Delvare <jdelvare@suse.de>
Link: https://patch.msgid.link/20250616-aspeed-lpc-snoop-fixes-v2-1-3cdd59c934d3@codeconstruct.com.au


Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>