libxl: Copy user-specified keymap to libxl build info struct

Commit 4dfc34c3 missed copying the user-specified keymap to
libxl_domain_build_info struct when creating a VFB device.
Signed-off-by: NStefan Bader <stefan.bader@canonical.com>
Signed-off-by: NJim Fehlig <jfehlig@suse.com>

src/libxl/libxl_conf.c

@@ -1200,6 +1200,9 @@ libxlMakeVfbList(virPortAllocatorPtr graphicsports,
             if (VIR_STRDUP(b_info->u.hvm.sdl.xauthority, vfb.sdl.xauthority) < 0)
                 goto error;
         }
+
+        if (VIR_STRDUP(b_info->u.hvm.keymap, vfb.keymap) < 0)
+            goto error;
     }
 
     return 0;