s390/pci: make zpci_set_irq()/zpci_clear_irq() static

Commit c1e18c17 ("s390/pci: add zpci_set_irq()/zpci_clear_irq()")
made zpci_set_irq()/zpci_clear_irq() non-static in preparation for using
them in zpci_hot_reset_device(). The version of zpci_hot_reset_device()
that was finally merged however exploits the fact that IRQs and DMA is
implicitly disabled by clp_disable_fh() so the call to zpci_clear_irq()
was never added. There are no other calls outside pci_irq.c so lets make
both functions static.
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

arch/s390/include/asm/pci.h

@@ -283,9 +283,6 @@ int zpci_dma_exit_device(struct zpci_dev *zdev);
 int __init zpci_irq_init(void);
 void __init zpci_irq_exit(void);
 
-int zpci_set_irq(struct zpci_dev *zdev);
-int zpci_clear_irq(struct zpci_dev *zdev);
-
 /* FMB */
 int zpci_fmb_enable_device(struct zpci_dev *);
 int zpci_fmb_disable_device(struct zpci_dev *);

arch/s390/pci/pci_irq.c

@@ -99,7 +99,7 @@ static int zpci_clear_directed_irq(struct zpci_dev *zdev)
 }
 
 /* Register adapter interruptions */
-int zpci_set_irq(struct zpci_dev *zdev)
+static int zpci_set_irq(struct zpci_dev *zdev)
 {
 	int rc;
 
@@ -115,7 +115,7 @@ int zpci_set_irq(struct zpci_dev *zdev)
 }
 
 /* Clear adapter interruptions */
-int zpci_clear_irq(struct zpci_dev *zdev)
+static int zpci_clear_irq(struct zpci_dev *zdev)
 {
 	int rc;