xhci: Clean up 32-bit build warnings.

Randy Dunlap points out that commit 9258c0b "xhci: Better debugging for
critical host errors." introduces some new build warnings on 32-bit
builds:

drivers/usb/host/xhci-ring.c:1936:3: warning: format '%016llx' expects type 'long long unsigned int', but argument 3 has type 'dma_addr_t'
drivers/usb/host/xhci-ring.c:1958:3: warning: format '%016llx' expects type 'long long unsigned int', but argument 3 has type 'dma_addr_t'

Cast the results of xhci_trb_virt_to_dma() from a dma_addr_t to an
unsigned long long.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Reported-by: Randy Dunlap <rdunlap@xenotime.net>

drivers/usb/host/xhci-ring.c

@@ -1934,7 +1934,8 @@ static int handle_tx_event(struct xhci_hcd *xhci,
 	if (!xdev) {
 		xhci_err(xhci, "ERROR Transfer event pointed to bad slot\n");
 		xhci_err(xhci, "@%016llx %08x %08x %08x %08x\n",
-			 xhci_trb_virt_to_dma(xhci->event_ring->deq_seg,
+			 (unsigned long long) xhci_trb_virt_to_dma(
+				 xhci->event_ring->deq_seg,
 				 xhci->event_ring->dequeue),
 			 lower_32_bits(le64_to_cpu(event->buffer)),
 			 upper_32_bits(le64_to_cpu(event->buffer)),
@@ -1956,7 +1957,8 @@ static int handle_tx_event(struct xhci_hcd *xhci,
 		xhci_err(xhci, "ERROR Transfer event for disabled endpoint "
 				"or incorrect stream ring\n");
 		xhci_err(xhci, "@%016llx %08x %08x %08x %08x\n",
-			 xhci_trb_virt_to_dma(xhci->event_ring->deq_seg,
+			 (unsigned long long) xhci_trb_virt_to_dma(
+				 xhci->event_ring->deq_seg,
 				 xhci->event_ring->dequeue),
 			 lower_32_bits(le64_to_cpu(event->buffer)),
 			 upper_32_bits(le64_to_cpu(event->buffer)),