usb: host: xhci: sparse fixes

drivers/usb/host/xhci.c:1826:14: warning: symbol 'xhci_get_block_size' was not declared. Should it be static?
drivers/usb/host/xhci.c:1844:14: warning: symbol 'xhci_get_largest_overhead' was not declared. Should it be static?
drivers/usb/host/xhci-ring.c:2304:36: warning: context imbalance in 'handle_tx_event' - unexpected unlock
drivers/usb/host/xhci-hub.c:425:6: warning: symbol 'xhci_set_remote_wake_mask' was not declared. Should it be static?

Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>

drivers/usb/host/xhci-hub.c

@@ -422,7 +422,7 @@ void xhci_set_link_state(struct xhci_hcd *xhci, __le32 __iomem **port_array,
 	xhci_writel(xhci, temp, port_array[port_id]);
 }
 
-void xhci_set_remote_wake_mask(struct xhci_hcd *xhci,
+static void xhci_set_remote_wake_mask(struct xhci_hcd *xhci,
 		__le32 __iomem **port_array, int port_id, u16 wake_mask)
 {
 	u32 temp;

drivers/usb/host/xhci-ring.c

@@ -2273,6 +2273,8 @@ static int process_bulk_intr_td(struct xhci_hcd *xhci, struct xhci_td *td,
  */
 static int handle_tx_event(struct xhci_hcd *xhci,
 		struct xhci_transfer_event *event)
+	__releases(&xhci->lock)
+	__acquires(&xhci->lock)
 {
 	struct xhci_virt_device *xdev;
 	struct xhci_virt_ep *ep;

drivers/usb/host/xhci.c

@@ -1829,7 +1829,7 @@ static void xhci_finish_resource_reservation(struct xhci_hcd *xhci,
 				xhci->num_active_eps);
 }
 
-unsigned int xhci_get_block_size(struct usb_device *udev)
+static unsigned int xhci_get_block_size(struct usb_device *udev)
 {
 	switch (udev->speed) {
 	case USB_SPEED_LOW:
@@ -1847,7 +1847,8 @@ unsigned int xhci_get_block_size(struct usb_device *udev)
 	}
 }
 
-unsigned int xhci_get_largest_overhead(struct xhci_interval_bw *interval_bw)
+static unsigned int
+xhci_get_largest_overhead(struct xhci_interval_bw *interval_bw)
 {
 	if (interval_bw->overhead[LS_OVERHEAD_TYPE])
 		return LS_OVERHEAD;