Fix typo causing improper datamodel lookup.

Author: Diptorup Deb

numba_dpex/core/parfors/parfor_lowerer.py

@@ -136,7 +136,7 @@ def _build_kernel_arglist(self, kernel_fn, lowerer):
             argtype = kernel_fn.kernel_arg_types[arg_num]
             llvm_val = _getvar(lowerer, arg)
             if isinstance(argtype, DpnpNdArray):
-                datamodel = dpex_dmm.lookup(arg_type)
+                datamodel = dpex_dmm.lookup(argtype)
                 self.kernel_builder.build_array_arg(
                     array_val=llvm_val,
                     array_data_model=datamodel,