[Libguestfs] [PATCH nbdkit] common: Improve pseudo-random number generation.

[Richard W.M. Jones]

This patch is rather obviously wrong if you examine the output
of the random plugin:

$ ./nbdkit -U - random size=1M --run 'qemu-img convert $nbd /tmp/random.img'
$ hexdump -C /tmp/random.img 
00000000  00 80 00 80 00 80 00 80  00 80 00 80 00 80 00 80  |................|
*
00100000

So um yes I'll try to fix this and improve the test too.

Rich.

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