x86/fpu/xstate: Address kernel-doc warning

Fix kernel-doc warning:

  arch/x86/kernel/fpu/xstate.c:1753: warning: Excess function parameter 'tsk' description in 'fpu_xstate_prctl'
Signed-off-by: Zhu Wang <wangzhu9@huawei.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: linux-kernel@vger.kernel.org

arch/x86/kernel/fpu/xstate.c

@@ -1736,7 +1736,6 @@ EXPORT_SYMBOL_GPL(xstate_get_guest_group_perm);
 
 /**
  * fpu_xstate_prctl - xstate permission operations
- * @tsk:	Redundant pointer to current
  * @option:	A subfunction of arch_prctl()
  * @arg2:	option argument
  * Return:	0 if successful; otherwise, an error code