Simplify mpool_get() and mpool_write() by using pread() and pwrite() instead of lseek()/_read() and lseek()/_write().
Simplify mpool_get() and mpool_write() by using pread() and pwrite()
instead of lseek()/_read() and lseek()/_write().

PR:		bin/54276
Submitted by:	<dnelson@allantgroup.com>

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