PCI: Fix pci_check_and_unmask_intx() comment typos

Fix typos in pci_check_and_unmask_intx() function comment.
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>

drivers/pci/pci.c

@@ -3138,7 +3138,7 @@ bool pci_check_and_mask_intx(struct pci_dev *dev)
 EXPORT_SYMBOL_GPL(pci_check_and_mask_intx);
 
 /**
- * pci_check_and_mask_intx - unmask INTx of no interrupt is pending
+ * pci_check_and_unmask_intx - unmask INTx if no interrupt is pending
  * @dev: the PCI device to operate on
  *
  * Check if the device dev has its INTx line asserted, unmask it if not