perf maps: Re-use __maps__free_maps_by_name()

maps__merge_in() hard codes the steps to free the maps_by_name list. It
seems to not map__put() each element before freeing, and it sets
maps_by_name_sorted to true after freeing, which may be harmless but
is inconsistent with maps__init() and other functions.

maps__maps_by_name_addr() is also quite hard to read because we already
have maps__maps_by_name() and maps__maps_by_address(), but the function
is only used in that place so delete it.

Reviewed-by: Ian Rogers <[email protected]>
Signed-off-by: James Clark <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Athira Rajeev <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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