fix(zlib): handle no flush flag in handle_.write (#21432)

Fixes https://github.com/denoland/deno/issues/21096

cli/tests/unit_node/zlib_test.ts

@@ -81,3 +81,18 @@ Deno.test(
     await promise;
   },
 );
+
+Deno.test(
+  "zlib flush i32",
+  // FIXME: Handle is not closed properly
+  { sanitizeResources: false },
+  function () {
+    const handle = createDeflate({
+      // @ts-expect-error: passing non-int flush value
+      flush: "",
+    });
+
+    handle.end();
+    handle.destroy();
+  },
+);

ext/node/polyfills/_zlib_binding.mjs

@@ -120,7 +120,7 @@ class Zlib {
     core.opAsync(
       "op_zlib_write_async",
       this.#handle,
-      flush,
+      flush ?? Z_NO_FLUSH,
       input,
       in_off,
       in_len,