Dereference pointer before async block

Author: GrantM11235

embedded-hal-async/src/spi.rs

@@ -61,14 +61,16 @@ where
 /// ```
 macro_rules! spi_transaction_helper {
     ($device:expr, move |$bus:ident| async move $closure_body:expr) => {
-        $crate::spi::SpiDevice::transaction($device, move |$bus| async move {
+        $crate::spi::SpiDevice::transaction($device, move |$bus| {
             // Safety: Implementers of the `SpiDevice` trait guarantee that the pointer is
             // valid and dereferencable for the entire duration of the closure.
             let $bus = unsafe { &mut *$bus };
-            let result = $closure_body;
-            let $bus = $bus; // Ensure that the bus reference was not moved out of the closure
-            let _ = $bus; // Silence the "unused variable" warning from prevous line
-            result
+            async move {
+                let result = $closure_body;
+                let $bus = $bus; // Ensure that the bus reference was not moved out of the closure
+                let _ = $bus; // Silence the "unused variable" warning from prevous line
+                result
+            }
         })
     };
 }