Staging: solo6x10: return -EFAULT on copy_to_user errors

copy_to_user() returns the number of bytes remaining to be copied, but
we want to return a negative error code here.
Signed-off-by: NDan Carpenter <error27@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/solo6x10/solo6010-g723.c

@@ -233,7 +233,7 @@ static int snd_solo_pcm_copy(struct snd_pcm_substream *ss, int channel,
 				   solo_pcm->g723_buf, G723_PERIOD_BYTES);
 
 		if (err)
-			return err; 
+			return -EFAULT;
 	}
 
 	return 0;