dmaengine: ep93xx: Fix typo in comments

Remove the repeated word 'and' from comments
Signed-off-by: Jiang Jian <jiangjian@cdjrlc.com>
Link: https://lore.kernel.org/r/20220622143158.15091-1-jiangjian@cdjrlc.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/ep93xx_dma.c

@@ -1183,7 +1183,7 @@ ep93xx_dma_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t dma_addr,
  *
  * Synchronizes the DMA channel termination to the current context. When this
  * function returns it is guaranteed that all transfers for previously issued
- * descriptors have stopped and and it is safe to free the memory associated
+ * descriptors have stopped and it is safe to free the memory associated
  * with them. Furthermore it is guaranteed that all complete callback functions
  * for a previously submitted descriptor have finished running and it is safe to
  * free resources accessed from within the complete callbacks.