malloc_trim - release free memory from the top of the heap
pad argument specifies the amount of free space to leave untrimmed at the top of the heap. If this argument is 0, only the minimum amount of memory is maintained at the top of the heap (i.e., one page or less). A nonzero argument can be used to maintain some trailing space at the top of the heap in order to allow future allocations to be made without having to extend the heap with sbrk(2).
The malloc_trim() function returns 1 if memory was actually released back to the system, or 0 if it was not possible to release any memory.
No errors are defined.
This function is a GNU extension.
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