seq_buf: fix a misleading comment

mainline inclsion
from mainline-v6.7-rc1
category: docs

The comment for seq_buf_has_overflowed() says that an overflow condition is
marked by len == size, but that's not what the code is testing.  Make the
comment match reality.

Link: https://lkml.kernel.org/r/87pm19kp0m.fsf@meer.lwn.net

Fixes: 8cd709a ("tracing: Have seq_buf use full buffer")
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
(cherry picked from commit 845e31e)
Signed-off-by: Wentao Guan <guanwentao@uniontech.com>

Author: Jonathan Corbet

include/linux/seq_buf.h

@@ -44,7 +44,7 @@ seq_buf_init(struct seq_buf *s, char *buf, unsigned int size)
 
 /*
  * seq_buf have a buffer that might overflow. When this happens
- * the len and size are set to be equal.
+ * len is set to be greater than size.
  */
 static inline bool
 seq_buf_has_overflowed(struct seq_buf *s)