geekbench: fix output files listing
geekbench: fix output files listing

After running the benchmark, when collecting the output files the execution
fails because the split('\n') call, used for creating a list of output files,
returns an empty string as last element. The empty string makes the pull command
fail because file '' doesn't exist on the target device.

Signed-off-by: Michele Di Giorgio <99fd0b6f5a4e02a4022988691284da2a0299b046@arm.com>

Sticklyman1936/workload-automation,Sticklyman1936/workload-automation,ep1cman/workload-automation,ep1cman/workload-automation,ep1cman/workload-automation,bathepawan/workload-automation,jimboatarm/workload-automation,jimboatarm/workload-automation,bjackman/workload-automation,ep1cman/workload-automation,bathepawan/workload-automation,bathepawan/workload-automation,bathepawan/workload-automation,bjackman/workload-automation,bjackman/workload-automation,Sticklyman1936/workload-automation,Sticklyman1936/workload-automation,bjackman/workload-automation,jimboatarm/workload-automation,jimboatarm/workload-automation,Sticklyman1936/workload-automation,jimboatarm/workload-automation,ep1cman/workload-automation,bjackman/workload-automation,bathepawan/workload-automation,ep1cman/workload-automation,jimboatarm/workload-automation,bjackman/workload-automation,bathepawan/workload-automation,Sticklyman1936/workload-automation