Directly use memalign instead of malloc to safe one indirection.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@25776 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/system/kernel/heap.cpp

@@ -1419,7 +1419,7 @@ realloc(void *address, size_t newSize)
 	}
 
 	if (address == NULL)
-		return malloc(newSize);
+		return memalign(0, newSize);
 
 	if (newSize == 0) {
 		free(address);