migration: show error message when postcopy fails

The 'info migrate' command only shows the error message when the
migration state is 'failed'. When postcopy is used, however,
the 'postcopy-paused' state is used instead of 'failed', so we
must show the error message there too.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Link: https://lore.kernel.org/qemu-devel/20250721133913.2914669-1-berrange@redhat.com
[line break to satisfy checkpatch]
Signed-off-by: Fabiano Rosas <farosas@suse.de>

migration/migration-hmp-cmds.c

@@ -151,7 +151,9 @@ void hmp_info_migrate(Monitor *mon, const QDict *qdict)
     if (info->has_status) {
         monitor_printf(mon, "Status: \t\t%s",
                        MigrationStatus_str(info->status));
-        if (info->status == MIGRATION_STATUS_FAILED && info->error_desc) {
+        if ((info->status == MIGRATION_STATUS_FAILED ||
+             info->status == MIGRATION_STATUS_POSTCOPY_PAUSED) &&
+            info->error_desc) {
             monitor_printf(mon, " (%s)\n", info->error_desc);
         } else {
             monitor_printf(mon, "\n");