unittests: Fix linter errors

test/unit/eval/tricks_spec.lua

@@ -4,8 +4,6 @@ local eval_helpers = require('test.unit.eval.helpers')
 local itp = helpers.gen_itp(it)
 
 local cimport = helpers.cimport
-local to_cstr = helpers.to_cstr
-local ffi = helpers.ffi
 local eq = helpers.eq
 
 local eval0 = eval_helpers.eval0

test/unit/eval/typval_spec.lua

@@ -2124,7 +2124,6 @@ describe('typval.c', function()
           neq(dis.a.di_tv.vval.v_dict, dis_deepcopy1.a.di_tv.vval.v_dict)
           neq(dis.b.di_tv.vval.v_list, dis_deepcopy1.b.di_tv.vval.v_list)
           eq(v, dct2tbl(d_deepcopy1))
-          local di_deepcopy1 = first_di(dis_deepcopy1.a.di_tv.vval.v_dict)
           alloc_log:clear()
         end
         collectgarbage()
@@ -2247,6 +2246,7 @@ describe('typval.c', function()
         local ll_l = nil
         ll[1] = ll
         local dd = {}
+        local dd_d = nil
         dd.dd = dd
         for _, v in ipairs({
           {nil_value},