unittests: Avoid alloc log checking errors when printing tests

test/unit/viml/expressions/parser_spec.lua

@@ -248,8 +248,7 @@ describe('Expressions parser', function()
       local hls = phl2lua(pstate)
       if exp_ast == nil then
         format_check(str, flags, ast, hls)
-        return
-      end
+      else
         eq(exp_ast, ast)
         if exp_highlighting_fs then
           local exp_highlighting = {}
@@ -259,6 +258,7 @@ describe('Expressions parser', function()
           end
           eq(exp_highlighting, hls)
         end
+      end
       lib.viml_pexpr_free_ast(east)
       kvi_destroy(pstate.colors)
       alloc_log:clear_tmp_allocs(true)