Revert the library code change of (#53), not touching the unit tests

Author: ni-vzavalishin

include/boost/pool/simple_segregated_storage.hpp

@@ -328,19 +328,6 @@ void * simple_segregated_storage<SizeType>::try_malloc_n(
     void * & start, size_type n, const size_type partition_size)
 {
   void * iter = nextof(start);
-  if (n == 1)
-  {
-    void * next = nextof(iter);
-    if (next != static_cast<char *>(iter) + partition_size)
-    {
-      start = iter;
-      return 0;
-    }
-    else
-    {
-      return iter;
-    }
-  }
   while (--n != 0)
   {
     void * next = nextof(iter);