NVIDIA/cnmem

Unused value warnings

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jfolz commented

I'm getting some set but unused value warnings:

cnmem.cpp:909:33: warning: variable ‘prev’ set but not used [-Wunused-but-set-variable]
     Block *curr = mUsedBlocks, *prev = NULL;
                                 ^~~~
cnmem.cpp:933:12: warning: variable ‘result’ set but not used [-Wunused-but-set-variable]
     Block *result = curr;
            ^~~~~~
cnmem.cpp:1221:31: warning: unused variable ‘lockStatus’ [-Wunused-variable]
                 cnmemStatus_t lockStatus = mutexes[i]->unlock();
                               ^~~~~~~~~~

Not a big deal, but as far as I can tell these are warranted. I can make a PR to fix these if that's OK to do and desired.