libperf: Adopt perf_mmap__get() function from tools/perf

Move perf_mmap__get() from tools/perf to libperf in the internal header
internal/mmap.h.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20191007125344.14268-6-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index f05e8b7..025a12b 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -293,7 +293,7 @@ static int record__aio_pushfn(struct mmap *map, void *to, void *buf, size_t size
 		 * after started aio request completion or at record__aio_push()
 		 * if the request failed to start.
 		 */
-		perf_mmap__get(map);
+		perf_mmap__get(&map->core);
 	}
 
 	aio->size += size;