[PATCH] minor size optimization for dd.c

[Tito]

Hi,
this patch reduces size of dd.c.
Size reduction is:

   text    data     bss     dec     hex filename
  1346       0       0    1346     542 coreutils/dd.o.orig
  1302       0       0    1302     516 coreutils/dd.o

Changes are trivial.

Please apply.

Ciao,
Tito


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