du no longer handles errors gracefully

[Mike Frysinger]

when encountering dirs missing the executable bit, du used to spit out an 
error but continue on its way ... with the new version though, the error 
forces premature failure with an helpful message :(

for example, this dir structure as a non-root user:
rm -rf foo
mkdir -p foo/{a,b,c}
touch foo/a/asdf

here is coreutils-5.94:
$ du
du: `./b': Permission denied
1       ./c
1       ./a
3       .

here is coreutils-6.4:
$ du
du: fts_read failed: Permission denied
-mike

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