Code review feedback.

src/pal/pal_freebsd_kernel.h

@@ -63,11 +63,10 @@ namespace snmalloc
     template<bool committed>
     void* reserve(size_t size, size_t align)
     {
-      size_t request = size;
       vm_offset_t addr;
       if (vmem_xalloc(
             kernel_arena,
-            request,
+            size,
             align,
             0,
             0,
@@ -81,10 +80,10 @@ namespace snmalloc
       if (committed)
       {
         if (
-          kmem_back(kernel_object, addr, request, M_ZERO | M_WAITOK) !=
+          kmem_back(kernel_object, addr, size, M_ZERO | M_WAITOK) !=
           KERN_SUCCESS)
         {
-          vmem_xfree(kernel_arena, addr, request);
+          vmem_xfree(kernel_arena, addr, size);
           return nullptr;
         }
       }

src/pal/pal_posix.h

@@ -54,7 +54,7 @@ namespace snmalloc
     void notify_not_using(void* p, size_t size) noexcept
     {
       assert(is_aligned_block<OS_PAGE_SIZE>(p, size));
-#ifndef NDEBUG
+#ifdef USE_POSIX_COMMIT_CHECKS
       mprotect(p, size, PROT_NONE);
 #else
       UNUSED(p);
@@ -77,7 +77,7 @@ namespace snmalloc
       if constexpr (zero_mem == YesZero)
         static_cast<OS*>(this)->template zero<true>(p, size);
 
-#ifndef NDEBUG
+#ifdef USE_POSIX_COMMIT_CHECKS
       mprotect(p, size, PROT_READ | PROT_WRITE);
 #else
       UNUSED(p);