dmaengine: Remove spaces before TABs

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20191206132435.29139-1-geert+renesas@glider.beSigned-off-by: Vinod Koul <vkoul@kernel.org>

include/linux/dmaengine.h

@@ -481,7 +481,7 @@ struct dmaengine_unmap_data {
  * @cookie: tracking cookie for this transaction, set to -EBUSY if
  *	this tx is sitting on a dependency list
  * @flags: flags to augment operation preparation, control completion, and
- * 	communicate status
+ *	communicate status
  * @phys: physical address of the descriptor
  * @chan: target channel for this operation
  * @tx_submit: accept the descriptor, assign ordered cookie and mark the