Fix error message on redirdev caps detection

src/qemu/qemu_command.c

@@ -9512,8 +9512,12 @@ qemuBuildCommandLine(virConnectPtr conn,
         virCommandAddArg(cmd, devstr);
         VIR_FREE(devstr);
 
-        if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE))
+        if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE)) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                           _("redirected devices are not supported by this QEMU"));
             goto error;
+        }
+
 
         virCommandAddArg(cmd, "-device");
         if (!(devstr = qemuBuildRedirdevDevStr(def, redirdev, qemuCaps)))

src/qemu/qemu_hotplug.c

@@ -1358,12 +1358,16 @@ int qemuDomainAttachRedirdevDevice(virQEMUDriverPtr driver,
     virDomainDefPtr def = vm->def;
     char *devstr = NULL;
 
-    if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_DEVICE)) {
+    if (!virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_DEVICE)) {
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                       _("redirected devices are not supported by this QEMU"));
+        goto error;
+    }
+
     if (qemuAssignDeviceRedirdevAlias(vm->def, redirdev, -1) < 0)
         goto error;
     if (!(devstr = qemuBuildRedirdevDevStr(def, redirdev, priv->qemuCaps)))
         goto error;
-    }
 
     if (VIR_REALLOC_N(vm->def->redirdevs, vm->def->nredirdevs+1) < 0)
         goto error;