misc: amd-sbi: Explicitly clear in/out arg "mb_in_out"

- New AMD processor will support different input/output for same command.
- In some scenarios the input value is not cleared, which will be added to
output before reporting the data.
- Clearing input explicitly will be a cleaner and safer approach.

Reviewed-by: Naveen Krishna Chatradhi <[e-mail]>
Signed-off-by: Akshay Gupta <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/misc/amd-sbi/rmi-core.c

···
 	ret = regmap_read(data->regmap, SBRMI_OUTBNDMSG7, &ec);
 	if (ret || ec)
 		goto exit_clear_alert;
+
+	/* Clear the input value before updating the output data */
+	msg->mb_in_out = 0;
+
 	/*
 	 * For a read operation, the initiator (BMC) reads the firmware
 	 * response Command Data Out[31:0] from SBRMI::OutBndMsg_inst[4:1]