Fix PCIe FLR detection

PCIe DevCap register is actually 32 bits, not 16 bits. Since FLR is
bit 28, we clearly are failing to detect FLR support.

Known to fix device reset with some SR-IOV devices.

* src/pci.c: fix pciDetectFunctionLevelReset()

src/pci.c

@@ -321,7 +321,7 @@ pciFindCapabilityOffset(pciDevice *dev, unsigned capability)
 static unsigned
 pciDetectFunctionLevelReset(pciDevice *dev)
 {
-    uint16_t caps;
+    uint32_t caps;
     uint8_t pos;
 
     /* The PCIe Function Level Reset capability allows
@@ -331,7 +331,7 @@ pciDetectFunctionLevelReset(pciDevice *dev)
      * on SR-IOV NICs at the moment.
      */
     if (dev->pcie_cap_pos) {
-        caps = pciRead16(dev, dev->pcie_cap_pos + PCI_EXP_DEVCAP);
+        caps = pciRead32(dev, dev->pcie_cap_pos + PCI_EXP_DEVCAP);
         if (caps & PCI_EXP_DEVCAP_FLR) {
             VIR_DEBUG("%s %s: detected PCIe FLR capability", dev->id, dev->name);
             return 1;