tracing: Fix infinite loop in tracing_read_pipe on overflowed print_trace_line

mainline inclusion
from mainline-v6.2-rc1
commit c1ac03af
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I69283
CVE: NA

--------------------------------

print_trace_line may overflow seq_file buffer. If the event is not
consumed, the while loop keeps peeking this event, causing a infinite loop.

Link: https://lkml.kernel.org/r/20221129113009.182425-1-yangjihong1@huawei.com



Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: stable@vger.kernel.org
Fixes: 088b1e42 ("ftrace: pipe fixes")
Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
Reviewed-by: Zheng Yejian <zhengyejian1@huawei.com>
Reviewed-by: Ye Weihua <yeweihua4@huawei.com>
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>