ocl: fixed OOB-access if invalid device was specified

[hfp]

• Fixed OOB-access if ACC_OPENCL_DEVICE specifies an invalid device.
• Print max. error even in case of failed validation (acc_bench_smm).
• Adjusted tolerance (acc_bench_smm).

[codecov[bot]]

Codecov Report

Merging #580 (eb168de) into develop (adf52d6) will decrease coverage by 0.0%. The diff coverage is n/a.

@@            Coverage Diff            @@
##           develop    #580     +/-   ##
=========================================
- Coverage     65.7%   65.7%   -0.1%     
=========================================
  Files          103     103             
  Lines        28601   28603      +2     
=========================================
  Hits         18813   18813             
- Misses        9788    9790      +2     

Flag	Coverage Δ
unittests	65.7% <ø> (-0.1%)	:arrow_down:
with-blas	65.7% <ø> (-0.1%)	:arrow_down:
with-libxsmm	65.8% <ø> (-0.1%)	:arrow_down:
with-mpi	66.2% <ø> (-0.1%)	:arrow_down:
with-openmp	65.0% <ø> (-0.1%)	:arrow_down:
without-mpi	61.5% <ø> (-0.1%)	:arrow_down:
without-openmp	64.9% <ø> (-0.1%)	:arrow_down:

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Impacted Files	Coverage Δ
src/block/dbcsr_block_access.F	50.8% <0.0%> (-0.3%)	:arrow_down:

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