[NFCI][scudo] Remove unused variable 'MaxCount' (#100201)

Summary:
Fixes "error: unused variable 'MaxCount' [-Werror,-Wunused-variable]",
which is no longer used after
#99409

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Differential Revision: https://phabricator.intern.facebook.com/D60251627

Author: thurstond

compiler-rt/lib/scudo/standalone/secondary.h

@@ -332,7 +332,6 @@ template <typename Config> class MapAllocatorCache {
   bool retrieve(Options Options, uptr Size, uptr Alignment, uptr HeadersSize,
                 LargeBlock::Header **H, bool *Zeroed) EXCLUDES(Mutex) {
     const uptr PageSize = getPageSizeCached();
-    const u32 MaxCount = atomic_load_relaxed(&MaxEntriesCount);
     // 10% of the requested size proved to be the optimal choice for
     // retrieving cached blocks after testing several options.
     constexpr u32 FragmentedBytesDivisor = 10;
@@ -449,7 +448,6 @@ template <typename Config> class MapAllocatorCache {
         Quarantine[I].invalidate();
       }
     }
-    const u32 MaxCount = atomic_load_relaxed(&MaxEntriesCount);
     for (u32 I = LRUHead; I != CachedBlock::InvalidEntry; I = Entries[I].Next) {
       Entries[I].MemMap.setMemoryPermission(Entries[I].CommitBase,
                                             Entries[I].CommitSize, 0);