IB/qib: Use pci_is_root_bus() to check whether it is a root bus
IB/qib: Use pci_is_root_bus() to check whether it is a root bus

Use pci_is_root_bus() instead of "if (bus->parent)" statement
for better readability.

Signed-off-by: Yijing Wang <ac442ed3e729ed4f09d087e9c319e1c47c72d6f1@huawei.com>
Signed-off-by: Bjorn Helgaas <f10ec01be0c6b54271af5c550cd257810bdf3268@google.com>
Acked-by: Mike Marciniszyn <8b6671d72f65e2bb5dd5241f258fc1c5c815d085@intel.com>
KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs