ALSA: hdsp: fix a test for copy_to_user() failure

The copy_to_user() function returns the number of bytes remaining to be
copied.  It doesn't return negatives.

Fixes: 66c8f759 ("ALSA: hdsp: Fix assignment in if condition")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/YNIzqpVR6L2t/RwJ@mwandaSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/rme9652/hdsp.c

@@ -4877,8 +4877,7 @@ static int snd_hdsp_hwdep_ioctl(struct snd_hwdep *hw, struct file *file, unsigne
 		memset(&hdsp_version, 0, sizeof(hdsp_version));
 		hdsp_version.io_type = hdsp->io_type;
 		hdsp_version.firmware_rev = hdsp->firmware_rev;
-		err = copy_to_user(argp, &hdsp_version, sizeof(hdsp_version));
-		if (err < 0)
+		if (copy_to_user(argp, &hdsp_version, sizeof(hdsp_version)))
 			return -EFAULT;
 		break;
 	}