Drivers: hv: vmbus: Fix the issue with freeing up hv_ctl_table_hdr

The check to free the Hyper-V control table header was reversed. This
fixes it.

Fixes: 81b18bc ("Drivers: HV: Send one page worth of kmsg dump over Hyper-V during panic")

Signed-off-by: Sunil Muthuswamy <[email protected]>
Signed-off-by: K. Y. Srinivasan <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
(cherry picked from commit 8afc06d)

Orabug: 28671425

Signed-off-by: Liam Merwick <[email protected]>
Reviewed-by: Darren Kenny <[email protected]>
Reviewed-by: Alejandro Jimenez <[email protected]>
Tested-by: Vijay Balakrishna <[email protected]>

Author: sunilmut

drivers/hv/vmbus_drv.c

@@ -1176,11 +1176,8 @@ static int vmbus_bus_init(void)
 
 	bus_unregister(&hv_bus);
 	free_page((unsigned long)hv_panic_page);
-	if (!hv_ctl_table_hdr) {
-		unregister_sysctl_table(hv_ctl_table_hdr);
-		hv_ctl_table_hdr = NULL;
-	}
-
+	unregister_sysctl_table(hv_ctl_table_hdr);
+	hv_ctl_table_hdr = NULL;
 	return ret;
 }
 
@@ -1891,11 +1888,8 @@ static void __exit vmbus_exit(void)
 	}
 
 	free_page((unsigned long)hv_panic_page);
-	if (!hv_ctl_table_hdr) {
-		unregister_sysctl_table(hv_ctl_table_hdr);
-		hv_ctl_table_hdr = NULL;
-	}
-
+	unregister_sysctl_table(hv_ctl_table_hdr);
+	hv_ctl_table_hdr = NULL;
 	bus_unregister(&hv_bus);
 
 	cpuhp_remove_state(hyperv_cpuhp_online);