Xen: add XENXL to virErrorDomain enum

Add "Xen XL Config" to the virErrorDomain enum and use it in
src/xenconfig/xen_xl.c.

include/libvirt/virterror.h

@@ -128,6 +128,7 @@ typedef enum {
     VIR_FROM_THREAD = 61,       /* Error from thread utils */
     VIR_FROM_ADMIN = 62,        /* Error from admin backend */
     VIR_FROM_LOGGING = 63,      /* Error from log manager */
+    VIR_FROM_XENXL = 64,        /* Error from Xen xl config code */
 
 # ifdef VIR_ENUM_SENTINELS
     VIR_ERR_DOMAIN_LAST

src/util/virerror.c

@@ -135,6 +135,7 @@ VIR_ENUM_IMPL(virErrorDomain, VIR_ERR_DOMAIN_LAST,
               "Thread jobs",
               "Admin Interface",
               "Log Manager",
+              "Xen XL Config",
     )
 
 

src/xenconfig/xen_xl.c

@@ -33,7 +33,7 @@
 #include "virstoragefile.h"
 #include "xen_xl.h"
 
-#define VIR_FROM_THIS VIR_FROM_NONE
+#define VIR_FROM_THIS VIR_FROM_XENXL
 
 /*
  * Xen provides a libxl utility library, with several useful functions,