libbpf: Fix null pointer dereference in btf_dump__free on allocation failure

When btf_dump__new() fails to allocate memory for the internal hashmap
(btf_dump->type_names), it returns an error code. However, the cleanup
function btf_dump__free() does not check if btf_dump->type_names is NULL
before attempting to free it. This leads to a null pointer dereference
when btf_dump__free() is called on a btf_dump object.

Fix: 351131b ("libbpf: add btf_dump API for BTF-to-C conversion")
Signed-off-by: chenyuan <chenyuan@kylinos.cn>

Author: chenyuan0001

tools/lib/bpf/btf_dump.c

@@ -227,6 +227,9 @@ static void btf_dump_free_names(struct hashmap *map)
 	size_t bkt;
 	struct hashmap_entry *cur;
 
+	if (!map)
+		return;
+
 	hashmap__for_each_entry(map, cur, bkt)
 		free((void *)cur->pkey);