Rollup merge of rust-lang#137620 - SergioGasquez:fix/espidf-maybeunit, r=ChrisDenton

Fix `attr` cast for espidf

rust-lang#136826 broke ESP-IDF builds with: https://github.com/esp-rs/esp-idf-template/actions/runs/13516221587/job/37765336588.

This PR fixes it.

cc: ``@ivmarkov`` ``@xizheyin``

Author: fmease

std/src/sys/pal/unix/thread.rs

@@ -59,7 +59,7 @@ impl Thread {
             assert_eq!(
                 libc::pthread_attr_setstacksize(
                     attr.as_mut_ptr(),
-                    cmp::max(stack, min_stack_size(&attr))
+                    cmp::max(stack, min_stack_size(attr.as_ptr()))
                 ),
                 0
             );