PCI: hv: Make unnecessarily global IRQ masking functions static

BugLink: http://bugs.launchpad.net/bugs/1670518

Make hv_irq_mask() and hv_irq_unmask() static as they are only used in
pci-hyperv.c

This fixes a sparse warning.
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: K. Y. Srinivasan <kys@microsoft.com>
(cherry picked from commit 542ccf45)
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Acked-by: Marcelo Cerri <marcelo.cerri@canonical.com>
Acked-by: Joseph Salisbury <joseph.salisbury@canonical.com>
Signed-off-by: Brad Figg <brad.figg@canonical.com>

drivers/pci/host/pci-hyperv.c

@@ -758,7 +758,7 @@ static int hv_set_affinity(struct irq_data *data, const struct cpumask *dest,
 	return parent->chip->irq_set_affinity(parent, dest, force);
 }
 
-void hv_irq_mask(struct irq_data *data)
+static void hv_irq_mask(struct irq_data *data)
 {
 	pci_msi_mask_irq(data);
 }
@@ -773,7 +773,7 @@ void hv_irq_mask(struct irq_data *data)
  * is built out of this PCI bus's instance GUID and the function
  * number of the device.
  */
-void hv_irq_unmask(struct irq_data *data)
+static void hv_irq_unmask(struct irq_data *data)
 {
 	struct msi_desc *msi_desc = irq_data_get_msi_desc(data);
 	struct irq_cfg *cfg = irqd_cfg(data);