Use standard Linux error codes.
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
  */
 int hv_init(void)
 {
-       int ret = 0;
        int max_leaf;
        union hv_x64_msr_hypercall_contents hypercall_msr;
        void *virtaddr = NULL;
        hv_context.signal_event_param->flag_number = 0;
        hv_context.signal_event_param->rsvdz = 0;
 
-       return ret;
+       return 0;
 
 cleanup:
        if (virtaddr) {
 
                vfree(virtaddr);
        }
-       ret = -1;
-       return ret;
+
+       return -ENOTSUPP;
 }
 
 /*