examples/rust: Further simplify hello-world

In this example we don't need the request buf.

Signed-off-by: Andrew Clayton <[email protected]>

Author: ac000

examples/rust/hello-world/src/lib.rs

@@ -11,10 +11,8 @@ use unit_wasm::rusty::*;
 #[no_mangle]
 pub extern "C" fn uwr_request_handler(addr: *mut u8) -> i32 {
     let ctx = &mut UWR_CTX_INITIALIZER();
-    let mut request_buf: *mut u8 = std::ptr::null_mut();
 
     uwr_init_ctx(ctx, addr, 4096);
-    uwr_set_req_buf(ctx, &mut request_buf, LUW_SRB_ALLOC);
 
     uwr_write_str!(
         ctx,
@@ -34,7 +32,5 @@ pub extern "C" fn uwr_request_handler(addr: *mut u8) -> i32 {
     uwr_http_send_response(ctx);
     uwr_http_response_end();
 
-    uwr_free(request_buf);
-
     return 0;
 }