Fix module probe failure on 32-bit systems

Previous commit 7ef5e54e2e28884a04dc800657967b891239e933 caused
module probe failure on 32-bit systems, dmesg showed

  Unknown symbol __moddi3

This was caused by the modulo operation 'gethrtime() % tqs->stqs_count'
in the committed code.  Instead of implementing __moddi3 for all 32-bit
systems, Behlendorf advised we can just cast the return value of
gethrtime() into a uint64_t, since gethrtime does not return negative
value on all circumstances we need not care about the potential overflow.

Signed-off-by: Ying Zhu <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Closes #1551

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