Revert "SUNRPC: Don't allow waiting for exiting tasks"

This reverts commit 14e41b1.

This patch breaks the LTP acct02 test, so let's revert and look for a
better solution.

Reported-by: Mark Brown <[email protected]>
Reported-by: Harshvardhan Jha <[email protected]>
Link: https://lore.kernel.org/linux-nfs/[email protected]/
Cc: [email protected] # 6.15.x
Signed-off-by: Trond Myklebust <[email protected]>

Author: Trond Myklebust

net/sunrpc/sched.c

@@ -276,8 +276,6 @@ EXPORT_SYMBOL_GPL(rpc_destroy_wait_queue);
 
 static int rpc_wait_bit_killable(struct wait_bit_key *key, int mode)
 {
-	if (unlikely(current->flags & PF_EXITING))
-		return -EINTR;
 	schedule();
 	if (signal_pending_state(mode, current))
 		return -ERESTARTSYS;