PCI/MSI: Fix pci_msix_vec_count() htmldocs failure

An empty line in msi.c caused "make htmldocs" failure:

  Warning(/home/iida/Repo/linux-next//drivers/pci/msi.c:962): bad line:

Fixes: ff1aa430 ("PCI/MSI: Add pci_msix_vec_count()")
Signed-off-by: NMasanari Iida <standby24x7@gmail.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>

drivers/pci/msi.c

@@ -966,7 +966,6 @@ EXPORT_SYMBOL(pci_disable_msi);
 /**
  * pci_msix_vec_count - return the number of device's MSI-X table entries
  * @dev: pointer to the pci_dev data structure of MSI-X device function
-
  * This function returns the number of device's MSI-X table entries and
  * therefore the number of MSI-X vectors device is capable of sending.
  * It returns a negative errno if the device is not capable of sending MSI-X