dw-dma: refine the channel_get messages

The original messages in channel_get are misleading. Refine the messages
to show the right messages.

Signed-off-by: Libin Yang <libin.yang@intel.com>

src/drivers/intel/dw-dma.c

@@ -320,16 +320,9 @@ static int dw_dma_channel_get(struct dma *dma, int req_chan)
  uint32_t flags;
  int i;
 
- if (req_chan >= dma->plat_data.channels) {
- trace_dwdma_error("dw-dma: %d invalid channel %d",
- dma->plat_data.id, req_chan);
- return -EINVAL;
- }
-
  spin_lock_irq(&dma->lock, flags);
 
- trace_dwdma("dw-dma: %d channel %d request", dma->plat_data.id,
- req_chan);
+ trace_dwdma("dw-dma %d request channel", dma->plat_data.id);
 
  /* find first free non draining channel */
  for (i = 0; i < DW_MAX_CHAN; i++) {
@@ -349,8 +342,7 @@ static int dw_dma_channel_get(struct dma *dma, int req_chan)
 
  /* DMAC has no free channels */
  spin_unlock_irq(&dma->lock, flags);
- trace_dwdma_error("dw-dma: %d channel %d not free", dma->plat_data.id,
- req_chan);
+ trace_dwdma_error("dw-dma %d no channel is free", dma->plat_data.id);
  return -ENODEV;
 }