Staging: intel_sst: return -EFAULT if copy_to_user() fails

copy_to_user() returns the number of bytes remaining to be copied but we
want to return an error code.  And that error code is -EFAULT not -EIO.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/intel_sst/intel_sst_app_interface.c

@@ -861,6 +861,8 @@ long intel_sst_ioctl(struct file *file_ptr, unsigned int cmd, unsigned long arg)
 				str_info->src = SST_DRV;
 				retval = copy_to_user(&str_param->stream_id,
 						&retval, sizeof(__u32));
+				if (retval)
+					retval = -EFAULT;
 			} else {
 				if (retval == -SST_ERR_INVALID_PARAMS)
 					retval = -EINVAL;
@@ -934,7 +936,7 @@ long intel_sst_ioctl(struct file *file_ptr, unsigned int cmd, unsigned long arg)
 		retval = copy_to_user((struct snd_sst_vol *)arg,
 						&get_vol, sizeof(get_vol));
 		if (retval) {
-			retval = -EIO;
+			retval = -EFAULT;
 			break;
 		}
 		/*sst_print_get_vol_info(str_id, &get_vol);*/