perf maps: Get map before returning in maps__find_by_name

Finding a map is done under a lock, returning the map without a
reference count means it can be removed without notice and causing
uses after free. Grab a reference count to the map within the lock
region and return this. Fix up locations that need a map__put
following this. Also fix some reference counted pointer comparisons.

Signed-off-by: Ian Rogers <[email protected]>
Acked-by: Namhyung Kim <[email protected]>
Cc: K Prateek Nayak <[email protected]>
Cc: James Clark <[email protected]>
Cc: Vincent Whitchurch <[email protected]>
Cc: Alexey Dobriyan <[email protected]>
Cc: Colin Ian King <[email protected]>
Cc: Changbin Du <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Song Liu <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: Athira Rajeev <[email protected]>
Cc: Liam Howlett <[email protected]>
Cc: Artem Savkov <[email protected]>
Cc: [email protected]
Signed-off-by: Namhyung Kim <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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