tools lib bpf: Rename bpf_map__get_fd() to bpf_map__fd()

For consistency, leaving "get" for reference counting.
Acked-by: Wang Nan <wangnan0@huawei.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Milian Wolff <milian.wolff@kdab.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/n/tip-msy8sxfz9th6gl2xjeci2btm@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/lib/bpf/libbpf.c

@@ -1311,12 +1311,9 @@ int bpf_program__nth_fd(struct bpf_program *prog, int n)
 	return fd;
 }
 
-int bpf_map__get_fd(struct bpf_map *map)
+int bpf_map__fd(struct bpf_map *map)
 {
-	if (!map)
-		return -EINVAL;
-
-	return map->fd;
+	return map ? map->fd : -EINVAL;
 }
 
 const struct bpf_map_def *bpf_map__def(struct bpf_map *map)

tools/lib/bpf/libbpf.h

@@ -180,7 +180,7 @@ bpf_map__next(struct bpf_map *map, struct bpf_object *obj);
 	     (pos) != NULL;				\
 	     (pos) = bpf_map__next((pos), (obj)))
 
-int bpf_map__get_fd(struct bpf_map *map);
+int bpf_map__fd(struct bpf_map *map);
 const struct bpf_map_def *bpf_map__def(struct bpf_map *map);
 const char *bpf_map__name(struct bpf_map *map);
 

tools/perf/util/bpf-loader.c

@@ -1270,7 +1270,7 @@ bpf_map_config_foreach_key(struct bpf_map *map,
 		pr_debug("ERROR: failed to get definition from map %s\n", name);
 		return -BPF_LOADER_ERRNO__INTERNAL;
 	}
-	map_fd = bpf_map__get_fd(map);
+	map_fd = bpf_map__fd(map);
 	if (map_fd < 0) {
 		pr_debug("ERROR: failed to get fd from map %s\n", name);
 		return map_fd;