sound: OSS: fix error return in dma_ioctl()

The returned error should stay negative

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/oss/audio.c b/sound/oss/audio.c
index b69c05b..7df48a2 100644
--- a/sound/oss/audio.c
+++ b/sound/oss/audio.c
@@ -838,7 +838,7 @@
 					if ((err = audio_devs[dev]->d->prepare_for_input(dev,
 						     dmap_in->fragment_size, dmap_in->nbufs)) < 0) {
 						spin_unlock_irqrestore(&dmap_in->lock,flags);
-						return -err;
+						return err;
 					}
 					dmap_in->dma_mode = DMODE_INPUT;
 					audio_devs[dev]->enable_bits |= PCM_ENABLE_INPUT;