pstore: fix one type of return value in pstore
the return type of function _read_ in pstore is size_t, but in the callback function of _read_, the logic doesn't consider it too much, which means if negative value (assuming error here) is returned, it will be converted to positive because of type casting. ssize_t is enough for this function. Signed-off-by: NChen Gong <gong.chen@linux.intel.com> Signed-off-by: NTony Luck <tony.luck@intel.com>
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