xen: avoid memleaks on error

When loading a Xen pv-kernel avoid memory leaks in case of errors.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

grub-core/loader/i386/xen.c

@@ -563,7 +563,7 @@ grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
     {
       err = grub_relocator_alloc_chunk_addr (relocator, &ch, max_addr, size);
       if (err)
-	return err;
+	goto fail;
 
       if (grub_initrd_load (&initrd_ctx, argv,
 			    get_virtual_current_address (ch)))