[MTHCA] cleaup: remove unused global variable
drwxr-xr-x - core
-rw-r--r-- 52 dirs
drwxr-xr-x - hw
drwxr-xr-x - inc
drwxr-xr-x - tests
drwxr-xr-x - tools
drwxr-xr-x - ulp