seedrng: do not hash in a constant string, it's not adding entropy

function                                             old     new   delta
seedrng_main                                         906     880     -26
.rodata                                           104899  104873     -26
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(add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-52)             Total: -52 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
1 file changed