[PATCH] clean up readprofile

[Tito]

Hi,
this patch cleans up the use of libbb functions in
readprofile. This is untested and needs some
testing and review by a volunteer.
Size reduction is:

   text    data     bss     dec     hex filename
   2724      31       0    2755     ac3 util-linux/readprofile.o.orig
root at localhost:/dev/pts/3:/root/Desktop/busybox# size util-linux/readprofile.o
   text    data     bss     dec     hex filename
   2622      31       0    2653     a5d util-linux/readprofile.o

Ciao,
Tito
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