BBlockCache: Initialize the mutex unconditionally.

Otherwise we may get assertion failures under the debug heaps.

src/kits/support/BlockCache.cpp

@@ -45,6 +45,8 @@ BBlockCache::BBlockCache(uint32 blockCount, size_t blockSize,
 	fFreeBlocks(0),
 	fBlockCount(blockCount)
 {
+	pthread_mutex_init(&fLock, NULL);
+
 	switch (allocationType) {
 		case B_OBJECT_CACHE:
 			fAlloc = &operator new[];
@@ -61,8 +63,6 @@ BBlockCache::BBlockCache(uint32 blockCount, size_t blockSize,
 	if (heap_debug_get_allocation_info != NULL)
 		return;
 
-	pthread_mutex_init(&fLock, NULL);
-
 	// To properly maintain a list of free buffers, a buffer must be
 	// large enough to contain the _FreeBlock struct that is used.
 	if (blockSize < sizeof(_FreeBlock))