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 _nheapmin()             Minimize Near Heap

 #include   <malloc.h>

 int _nheapmin(void);

    _nheapmin() is the near heap version of _heapmin(); it checks the
    near heap for minimal consistency and returns unused memory back
    to the system. It takes no arguments, and returns 0 if successful, and
    -1 for failure. See _heapmin() for more details.

    Returns:    0 if successful; -1 otherwise.

 Portability:   Not supported by the ANSI standard.