Fix overflow of nbatch

[Vaibhav Jain]

Hi Everyone,

With a1b4f28, to compute current_space, nbatch is being multiplied
by BLCKSZ. nbatch is int and when multiplied with BLCKSZ, it can
easily overflow the int limit.To keep the calculation safe for
current_space, convert nbatch to size_t.

Please find a patch for the same.

Thanks,
Vaibhav

0001-Fix-overflow-of-nbatch.patch
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