s390/fpu: Remove comment about TIF_FPU

It has been removed in commit 2c6b9676 ("s390/fpu: remove TIF_FPU"),
so we should not mention TIF_FPU in the comment here anymore. Since the
remaining parts of the comment just document the obvious fact that
save_user_fpu_regs() saves the FPU state, simply remove the comment now
completely.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Link: https://lore.kernel.org/r/20240503080648.81461-1-thuth@redhat.comSigned-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

arch/s390/kernel/process.c

@@ -86,11 +86,6 @@ void arch_release_task_struct(struct task_struct *tsk)
 
 int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
 {
-	/*
-	 * Save the floating-point or vector register state of the current
-	 * task and set the TIF_FPU flag to lazy restore the FPU register
-	 * state when returning to user space.
-	 */
 	save_user_fpu_regs();
 
 	*dst = *src;