perf tools: Rename parse_events__free_terms() to parse_events_terms__delete()

To follow convention used in other tools/perf/ areas. Also remove the
need to check if it is NULL before calling the destructor, again, to
follow convention that goes back to free().

Cc: Alexei Starovoitov <[email protected]>
Cc: He Kuang <[email protected]>
cc: Jiri Olsa <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Wang Nan <[email protected]>
Cc: Zefan Li <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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