misc: Another round of static analysis fixups

Mostly addressing uninitialised members.

src/dev/virtio/base.cc

@@ -43,7 +43,8 @@
 
 VirtDescriptor::VirtDescriptor(PortProxy &_memProxy, VirtQueue &_queue,
                                Index descIndex)
-    : memProxy(&_memProxy), queue(&_queue), _index(descIndex)
+    : memProxy(&_memProxy), queue(&_queue), _index(descIndex),
+      desc{0, 0, 0, 0}
 {
 }
 

src/dev/virtio/base.hh

@@ -479,7 +479,7 @@ public:
         } M5_ATTR_PACKED;
 
         VirtRing<T>(PortProxy &proxy, uint16_t size)
-            : ring(size), _proxy(proxy), _base(0) {}
+        : header{0, 0}, ring(size), _proxy(proxy), _base(0) {}
 
         /**
          * Set the base address of the VirtIO ring buffer.

src/dev/virtio/fs9p.cc

@@ -291,7 +291,7 @@ VirtIO9PProxy::writeAll(const uint8_t *data, size_t len)
 
 VirtIO9PDiod::VirtIO9PDiod(Params *params)
     : VirtIO9PProxy(params),
-      fd_to_diod(-1), fd_from_diod(-1)
+      fd_to_diod(-1), fd_from_diod(-1), diod_pid(-1)
 {
 }
 

src/dev/virtio/pci.cc

@@ -43,8 +43,8 @@
 #include "params/PciVirtIO.hh"
 
 PciVirtIO::PciVirtIO(const Params *params)
-    : PciDevice(params), vio(*params->vio),
-      callbackKick(this)
+    : PciDevice(params), queueNotify(0), interruptDeliveryPending(false),
+      vio(*params->vio), callbackKick(this)
 {
     // Override the subsystem ID with the device ID from VirtIO
     config.subsystemID = htole(vio.deviceId);