bug#19784: build fails on make-prime-list when asan is enabled

[Yury Usishchev]

Hello!

We tried to build coreutils with address sanitizer enabled and 
encountered an error:

  GEN      src/primes.h
==12657== ERROR: AddressSanitizer: heap-buffer-overflow

This can be reproduced on git master using gcc-4.8 or gcc-4.9 by
git clone
export CFLAGS="-fsanitize=address"
./bootstrap
./configure
make

and is caused by line
src/make-prime-list.c:214:      while (i < size && sieve[++i] == 0)

When 'i' reaches 'size-1' it gets incremented and then 
(unallocated)memory is accessed.

I attached patch that can fix this issue.

--
BR,
Yury Usishchev

asan_prime_fix.diff
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