usb: host: ehci: Use dma_pool_zalloc()

Use dma_pool_zalloc() instead of dma_pool_alloc + memset

Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/ehci-sched.c

@@ -1287,7 +1287,7 @@ itd_urb_transaction(
 		} else {
  alloc_itd:
 			spin_unlock_irqrestore(&ehci->lock, flags);
-			itd = dma_pool_alloc(ehci->itd_pool, mem_flags,
+			itd = dma_pool_zalloc(ehci->itd_pool, mem_flags,
 					&itd_dma);
 			spin_lock_irqsave(&ehci->lock, flags);
 			if (!itd) {
@@ -1297,7 +1297,6 @@ itd_urb_transaction(
 			}
 		}
 
-		memset(itd, 0, sizeof(*itd));
 		itd->itd_dma = itd_dma;
 		itd->frame = NO_FRAME;
 		list_add(&itd->itd_list, &sched->td_list);
@@ -2081,7 +2080,7 @@ sitd_urb_transaction(
 		} else {
  alloc_sitd:
 			spin_unlock_irqrestore(&ehci->lock, flags);
-			sitd = dma_pool_alloc(ehci->sitd_pool, mem_flags,
+			sitd = dma_pool_zalloc(ehci->sitd_pool, mem_flags,
 					&sitd_dma);
 			spin_lock_irqsave(&ehci->lock, flags);
 			if (!sitd) {
@@ -2091,7 +2090,6 @@ sitd_urb_transaction(
 			}
 		}
 
-		memset(sitd, 0, sizeof(*sitd));
 		sitd->sitd_dma = sitd_dma;
 		sitd->frame = NO_FRAME;
 		list_add(&sitd->sitd_list, &iso_sched->td_list);