Fix global allocator

Don't overwrite the pointer with the status, which will be 0.

Fixes: f2cc919c

 ("Update uefi dep, fix building on nightly")
Signed-off-by: Tim Crawford <tcrawford@system76.com>

src/lib.rs

@@ -29,7 +29,7 @@ unsafe impl GlobalAlloc for Allocator {
         .branch();
 
         match res {
-            ControlFlow::Continue(ptr) => ptr as *mut u8,
+            ControlFlow::Continue(_) => ptr as *mut u8,
             ControlFlow::Break(_) => ptr::null_mut(),
         }
     }