tracing: Use seq_buf_used() in seq_buf_to_user() instead of len
commit 5ac48378 ("tracing: Use trace_seq_used() and seq_buf_used() instead of len") changed the tracing code to use trace_seq_used() and seq_buf_used() instead of using the seq_buf len directly to avoid overflow issues, but missed a spot in seq_buf_to_user() that makes use of s->len. Cleaned up the code a bit as well per suggestion of Steve Rostedt. Link: http://lkml.kernel.org/r/1447703848-2951-1-git-send-email-jsnitsel@redhat.comSigned-off-by: NJerry Snitselaar <jsnitsel@redhat.com> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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