src/io/MemMgrAllocator.cc: PVS-Studio: Potentially infinite loop

[SviatoslavRazmyslov]

We have found and fixed a bug using PVS-Studio tool. PVS-Studio is a static code analyzer for C, C++ and C#: https://www.viva64.com/en/pvs-studio/

We suggests having a look at the emails, sent from @pvs-studio.com.

Analyzer warning: V776 Potentially infinite loop. The variable in the loop exit condition 'last < 0' does not change its value between iterations. memmgrallocator.cc 140

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