macsmc: rtkit: Return -EIO instead of negated SMC results

SMC most certainly does not return linux errno values as result. The
return value of 132 for missing SMC keys does not make sense as ERFKILL.

Signed-off-by: Janne Grunau <j@jannau.net>

Author: jannau

drivers/platform/apple/smc_rtkit.c

@@ -145,7 +145,7 @@ static int apple_smc_cmd(struct apple_smc_rtkit *smc, u64 cmd, u64 arg,
 
 	result = FIELD_GET(SMC_RESULT, smc->cmd_ret);
 	if (result != 0)
-		return -result;
+		return -EIO;
 
 	if (ret_data)
 		*ret_data = FIELD_GET(SMC_DATA, smc->cmd_ret);