octeon_ep: Remove useless casting value returned by vzalloc to structure

coccinelle reports a warning

WARNING: casting value returned by memory allocation
function to (struct octep_rx_buffer *) is useless.

To fix this the useless cast is removed.

Signed-off-by: Jules Irenge <jbi.octave@gmail.com>
Link: https://lore.kernel.org/r/Yx+sr9o0uylXVcOl@playground
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/marvell/octeon_ep/octep_rx.c

@@ -158,8 +158,7 @@ static int octep_setup_oq(struct octep_device *oct, int q_no)
 		goto desc_dma_alloc_err;
 	}
 
-	oq->buff_info = (struct octep_rx_buffer *)
-			vzalloc(oq->max_count * OCTEP_OQ_RECVBUF_SIZE);
+	oq->buff_info = vzalloc(oq->max_count * OCTEP_OQ_RECVBUF_SIZE);
 	if (unlikely(!oq->buff_info)) {
 		dev_err(&oct->pdev->dev,
 			"Failed to allocate buffer info for OQ-%d\n", q_no);