perf synthetic-events: Avoid unnecessary memset

Make sure the memset of a synthesized event only zeros the necessary
tracing data part of the event, as a full event can be over 4kb in
size.

Signed-off-by: Ian Rogers <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Anne Macedo <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Athira Rajeev <[email protected]>
Cc: Casey Chen <[email protected]>
Cc: Chaitanya S Prakash <[email protected]>
Cc: Colin Ian King <[email protected]>
Cc: Dominique Martinet <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: James Clark <[email protected]>
Cc: Jann Horn <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Masahiro Yamada <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Sun Haiyong <[email protected]>
Cc: Weilin Wang <[email protected]>
Cc: Yang Jihong <[email protected]>
Cc: Yunseong Kim <[email protected]>
Cc: Ze Gao <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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