Fix typo introduced during nbfp_comb refactoring
!1069 (merged) (d440c46e) introduced a bug in OpenCL NBXNM kernel.
Closes #3973 (closed)
Edited by Andrey Alekseenko
!1069 (merged) (d440c46e) introduced a bug in OpenCL NBXNM kernel.
Closes #3973 (closed)