tracing: Simplify calculating entry size using struct_size()
When tracing a dynamic string field for a synthetic event, the offset calculation for where to write the next event can use struct_size() to find what the current size of the structure is. This simplifies the code and makes it less error prone. Link: https://lkml.kernel.org/r/20230117152235.698632147@goodmis.org Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Tom Zanussi <zanussi@kernel.org> Cc: Ross Zwisler <zwisler@google.com> Cc: Ching-lin Yu <chinglinyu@google.com> Signed-off-by:Steven Rostedt (Google) <rostedt@goodmis.org>
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