ia64: switch to kernel_clone()

The old _do_fork() helper is removed in favor of the new kernel_clone() helper.
The latter adheres to naming conventions for kernel internal syscall helpers.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: linux-ia64@vger.kernel.org
Link: https://lore.kernel.org/r/20200819104655.436656-4-christian.brauner@ubuntu.com

arch/ia64/kernel/process.c

@@ -310,7 +310,7 @@ ia64_load_extra (struct task_struct *task)
  *
  *	<clone syscall>	        <some kernel call frames>
  *	sys_clone		   :
- *	_do_fork		_do_fork
+ *	kernel_clone		kernel_clone
  *	copy_thread		copy_thread
  *
  * This means that the stack layout is as follows:
@@ -455,7 +455,7 @@ asmlinkage long ia64_clone(unsigned long clone_flags, unsigned long stack_start,
 		.tls		= tls,
 	};
 
-	return _do_fork(&args);
+	return kernel_clone(&args);
 }
 
 static void