regression in `ls -x` introduced between 6.7 and 6.8

[Mike Frysinger]

seems a bug has slipped into ls.c when using -x ... here's the testcase:
$ mkdir ~/entries
$ cd ~/entries
$ touch computers home
$ ls ~/entries
computers home
$ ls -x ~/entries
home        home

no LANG/LC_* vars are set ... one thing to note here is that the spacing for 
the first "home" is the correct spacing for "computers" ...

testing vanilla coreutils-6.7 and coreutils-6.8 on x86/Linux shows that 6.7 
behaves properly but 6.8 does not ... taking the ls.c from 6.7 and dropping 
it into 6.8 gives correct behavior as well ... testing on amd64 doesnt seem 
to exhibit this bug

the build was done in the default way:
./configure
make
./src/ls ...

also noticed that building with -O2 -Wall warns about displayed_width might be 
used uninitialized ...
-mike

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