QError: Add QERR_DEVICE_NOT_FOUND

New class for device not found errors.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/qerror.c b/qerror.c
index 10b0939..a12e7f7 100644
--- a/qerror.c
+++ b/qerror.c
@@ -40,6 +40,10 @@
  * "running out of foo: %(foo)%%"
  */
 const QErrorStringTable qerror_table[] = {
+    {
+        .error_fmt = QERR_DEVICE_NOT_FOUND,
+        .desc      = "The %(device) device has not been found",
+    },
     {}
 };