[PATCH] dd: do not unnecesarilly allocate memory for input block size, when not needed

[Ondřej Vašík]

Hello,
as reported in https://bugzilla.redhat.com/show_bug.cgi?id=502026, in dd
is an unnecessary memory allocation for input block even if input block
buffer is not needed (skip and count set to 0). Attached patch should
prevent memory exhaustion error in that very special case. I guess
mentioning in NEWS is not required in that case...

Greetings,
         Ondřej Vašík

dd-no-allocate.patch
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