remove unused variable 'cellBB'

31 jobs for master in 95 minutes and 47 seconds (queued for 5 seconds)
Name Stage Failure
failed
gcc_5_hybrid_dbg Test
[ 95%] Linking CXX executable PoiseuilleChannel
[ 95%] Built target PoiseuilleChannel
[ 95%] Linking CXX executable CouetteFlow
[ 95%] Built target CouetteFlow
[ 95%] Linking CXX executable SchaeferTurek
[ 95%] Built target SchaeferTurek
make: *** [all] Error 2
Makefile:138: recipe for target 'all' failed
ERROR: Job failed: exit code 1
failed
gcc_5_hybrid Test
[100%] Built target 02_Tutorial_ConfinedGasExtended
[100%] Built target 03_LBLidDrivenCavity
[100%] Linking CXX executable 02_BasicLBM_ExemplaryExtensions
[100%] Linking CXX executable 01_BasicLBM
[100%] Built target 02_BasicLBM_ExemplaryExtensions
[100%] Built target 01_BasicLBM
Makefile:138: recipe for target 'all' failed
make: *** [all] Error 2
ERROR: Job failed: exit code 1
failed
gcc_5_serial_dbg Test
[ 98%] Linking CXX executable 02_Tutorial_ConfinedGasExtended
[ 98%] Built target 02_Tutorial_ConfinedGasExtended
[ 98%] Linking CXX executable 01_BasicLBM
[ 98%] Built target 01_BasicLBM
[100%] Linking CXX executable 02_BasicLBM_ExemplaryExtensions
[100%] Built target 02_BasicLBM_ExemplaryExtensions
Makefile:138: recipe for target 'all' failed
make: *** [all] Error 2
ERROR: Job failed: exit code 1