sysctl: Remove debugging dump_stack

Remove unneeded dump_stack in __register_sysctl_table
Signed-off-by: Joel Granados <j.granados@samsung.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>

fs/proc/proc_sysctl.c

@@ -1406,7 +1406,6 @@ struct ctl_table_header *__register_sysctl_table(
 	spin_unlock(&sysctl_lock);
 fail:
 	kfree(header);
-	dump_stack();
 	return NULL;
 }