test: io: update i/o api usage re: b_error

io-test/mkdir.c

@@ -0,0 +1,21 @@
+#include <blue/io/directory.h>
+
+int main(int argc, const char **argv)
+{
+	if (argc < 2) {
+		return -1;
+	}
+
+	const char *path = argv[1];
+
+	b_directory *dir;
+	b_result result = b_directory_open(
+		NULL, B_RV_PATH(path), B_DIRECTORY_OPEN_CREATE_INTERMEDIATE, &dir);
+	if (b_result_is_error(result)) {
+		b_throw(result);
+		return -1;
+	}
+
+	b_directory_release(dir);
+	return 0;
+}