libbpf: Use map_is_created helper in map setters

Refactoring: use map_is_created helper in map setters that need to check
the state of the map. This helps to reduce the number of the places that
depend explicitly on the loaded flag, simplifying refactoring in the
next patch of this set.

Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20250303135752.158343-2-mykyta.yatsenko5@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

Author: mykyta5

tools/lib/bpf/libbpf.c

@@ -4845,14 +4845,19 @@ static int bpf_get_map_info_from_fdinfo(int fd, struct bpf_map_info *info)
 	return 0;
 }
 
+static bool map_is_created(const struct bpf_map *map)
+{
+	return map->obj->loaded || map->reused;
+}
+
 bool bpf_map__autocreate(const struct bpf_map *map)
 {
 	return map->autocreate;
 }
 
 int bpf_map__set_autocreate(struct bpf_map *map, bool autocreate)
 {
-	if (map->obj->loaded)
+	if (map_is_created(map))
 		return libbpf_err(-EBUSY);
 
 	map->autocreate = autocreate;
@@ -4946,7 +4951,7 @@ struct bpf_map *bpf_map__inner_map(struct bpf_map *map)
 
 int bpf_map__set_max_entries(struct bpf_map *map, __u32 max_entries)
 {
-	if (map->obj->loaded)
+	if (map_is_created(map))
 		return libbpf_err(-EBUSY);
 
 	map->def.max_entries = max_entries;
@@ -5191,11 +5196,6 @@ bpf_object__populate_internal_map(struct bpf_object *obj, struct bpf_map *map)
 
 static void bpf_map__destroy(struct bpf_map *map);
 
-static bool map_is_created(const struct bpf_map *map)
-{
-	return map->obj->loaded || map->reused;
-}
-
 static int bpf_object__create_map(struct bpf_object *obj, struct bpf_map *map, bool is_inner)
 {
 	LIBBPF_OPTS(bpf_map_create_opts, create_attr);
@@ -10299,7 +10299,7 @@ static int map_btf_datasec_resize(struct bpf_map *map, __u32 size)
 
 int bpf_map__set_value_size(struct bpf_map *map, __u32 size)
 {
-	if (map->obj->loaded || map->reused)
+	if (map_is_created(map))
 		return libbpf_err(-EBUSY);
 
 	if (map->mmaped) {
@@ -10345,7 +10345,7 @@ int bpf_map__set_initial_value(struct bpf_map *map,
 {
 	size_t actual_sz;
 
-	if (map->obj->loaded || map->reused)
+	if (map_is_created(map))
 		return libbpf_err(-EBUSY);
 
 	if (!map->mmaped || map->libbpf_type == LIBBPF_MAP_KCONFIG)