PCI: Tidy comments

Make comments follow multi-line comment conventions. No functional change
intended.

Link: https://lore.kernel.org/r/YUZJenW2UCA4Qu0O@pranay-desktopSigned-off-by: Pranay Sanghai <pranaysanghai@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/setup-irq.c

@@ -8,7 +8,6 @@
  *	David Miller (davem@redhat.com)
  */
 
-
 #include <linux/kernel.h>
 #include <linux/pci.h>
 #include <linux/errno.h>
@@ -28,25 +27,26 @@ void pci_assign_irq(struct pci_dev *dev)
 		return;
 	}
 
-	/* If this device is not on the primary bus, we need to figure out
-	   which interrupt pin it will come in on.   We know which slot it
-	   will come in on 'cos that slot is where the bridge is.   Each
-	   time the interrupt line passes through a PCI-PCI bridge we must
-	   apply the swizzle function.  */
-
+	/*
+	 * If this device is not on the primary bus, we need to figure out
+	 * which interrupt pin it will come in on. We know which slot it
+	 * will come in on because that slot is where the bridge is. Each
+	 * time the interrupt line passes through a PCI-PCI bridge we must
+	 * apply the swizzle function.
+	 */
 	pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
 	/* Cope with illegal. */
 	if (pin > 4)
 		pin = 1;
 
 	if (pin) {
-		/* Follow the chain of bridges, swizzling as we go.  */
+		/* Follow the chain of bridges, swizzling as we go. */
 		if (hbrg->swizzle_irq)
 			slot = (*(hbrg->swizzle_irq))(dev, &pin);
 
 		/*
-		 * If a swizzling function is not used map_irq must
-		 * ignore slot
+		 * If a swizzling function is not used, map_irq() must
+		 * ignore slot.
 		 */
 		irq = (*(hbrg->map_irq))(dev, slot, pin);
 		if (irq == -1)
@@ -56,7 +56,9 @@ void pci_assign_irq(struct pci_dev *dev)
 
 	pci_dbg(dev, "assign IRQ: got %d\n", dev->irq);
 
-	/* Always tell the device, so the driver knows what is
-	   the real IRQ to use; the device does not use it. */
+	/*
+	 * Always tell the device, so the driver knows what is the real IRQ
+	 * to use; the device does not use it.
+	 */
 	pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
 }