dd: fix nocache flag handling at EOF #9818
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Theres a GNU test that validates that the value 0 is used in the strace when clearing the cache in the trace for posix_fadvise. This is because 0 as an input for the length of the file means until the end of the file. This simplifies the code and removes the need for the helper functions.
What was also missing was a check to clear the caches if the read buffer is empty for when it reaches the EOF