[S390] prng: fix pointer arithmetic
The git commit c708c57e fixed the access beyond the end of the stack in prng_seed but the pointer arithmetic is still incorrect. The calculation has been off by a factor of 64, now it is only off by a factor of 8. prng_seed is called with a maximum of 16 for nbytes, small enough that the incorrect calculation stays insides the limits of the stack. Place parentheses for correct pointer arithmetic. Signed-off-by:Martin Schwidefsky <schwidefsky@de.ibm.com>
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