bug#34923: Message/race bug in 'dd'

[Paul Eggert]

Daniel A. Gauthier wrote:
> NOTICE that the "+nn" value on the line is always one off.  It says +0
> after the first error, +1 after the second, etc. until the correct count
> of error/short blocks is given at the end.

The count is supposed to just count short blocks, not errors. This is a POSIX 
requirement. I installed the attached documentation patch to try to make this 
clearer.

Perhaps dd should output a separate line to stderr that summaries I/O errors; it 
could do that without violating POSIX.

0001-dd-improve-doc-of-stderr-output.patch
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