error: New QERR_DEVICE_NO_BUS

qerror.c

@@ -72,6 +72,10 @@ static const QErrorStringTable qerror_table[] = {
         .error_fmt = QERR_DEVICE_NOT_REMOVABLE,
         .desc      = "Device '%(device)' is not removable",
     },
+    {
+        .error_fmt = QERR_DEVICE_NO_BUS,
+        .desc      = "Device '%(device)' has no child bus",
+    },
     {
         .error_fmt = QERR_FD_NOT_FOUND,
         .desc      = "File descriptor named '%(name)' not found",

qerror.h

@@ -66,6 +66,9 @@ QError *qobject_to_qerror(const QObject *obj);
 #define QERR_DEVICE_NOT_REMOVABLE \
     "{ 'class': 'DeviceNotRemovable', 'data': { 'device': %s } }"
 
+#define QERR_DEVICE_NO_BUS \
+    "{ 'class': 'DeviceNoBus', 'data': { 'device': %s } }"
+
 #define QERR_FD_NOT_FOUND \
     "{ 'class': 'FdNotFound', 'data': { 'name': %s } }"