qemu_driver.c: don't close an arbitrary file descriptor

* src/qemu/qemu_driver.c (qemudStartVMDaemon): Initialize "logfile"
to ensure that we don't use it uninitialized -- thus closing an
arbitrary file descriptor -- in the cleanup block.

src/qemu/qemu_driver.c

@@ -3159,7 +3159,7 @@ static int qemudStartVMDaemon(virConnectPtr conn,
     int pos = -1;
     char ebuf[1024];
     char *pidfile = NULL;
-    int logfile;
+    int logfile = -1;
     qemuDomainObjPrivatePtr priv = vm->privateData;
 
     struct qemudHookData hookData;