fix: handle void return type in TailHandler error path with ROCm6 compiler (clang++) (#3477)

Replace `decltype(TailHandler<>(...)){}` with direct function call
to fix compilation error when return type is void.

Co-authored-by: Yi DING <yi.ding@amd.com>

Author: xudonlyu

include/ck_tile/ops/flatmm/pipeline/flatmm_pipeline_agmem_bgmem_creg_v1.hpp

@@ -60,7 +60,7 @@ struct BaseFlatmmPipelineAGmemBGmemCRegV1
         else
         {
             assert(("Wrong TailNumber!", false));
-            return decltype(TailHandler<>(run_func, true, TailNumber::Even)){};
+            return TailHandler<DispatchHotloop, TailNumber::Even>(run_func, has_hot_loop);
         }
     }
 };