cl: Don't use device_infos if num_device_infos == 0
valgrind pointed me to this, after I got seemingly random fails.
Fixes: 4f2016b2 ("cl: clGetDeviceInfo check returned values")
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valgrind pointed me to this, after I got seemingly random fails.
Fixes: 4f2016b2 ("cl: clGetDeviceInfo check returned values")