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/[email protected]

Cc: Masami Hiramatsu <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Tom Zanussi <[email protected]>
Cc: Ross Zwisler <[email protected]>
Cc: Ching-lin Yu <[email protected]>
Signed-off-by: Steven Rostedt (Google) <[email protected]>

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