perf parse-events: Check if the software events array slots are populated

To avoid a NULL pointer dereference when the kernel supports the new
feature but the tooling still hasn't an entry for it.

This happened with the recently added PERF_COUNT_SW_CGROUP_SWITCHES
software event.

Reported-by: Thomas Richter <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Sumanth Korikkar <[email protected]>
Link: https://lore.kernel.org/linux-perf-users/[email protected]/
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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