fix regression issue

driver/level3/level3_thread.c

@@ -742,7 +742,11 @@ static int gemm_driver(blas_arg_t *args, BLASLONG *range_m, BLASLONG
     num_parts  = 0;
     while (n > 0){
       width = blas_quickdivide(n + nthreads - num_parts - 1, nthreads - num_parts);
+#if defined(POWER) 
+      if (width < switch_ratio ) {
+#else
       if (width < switch_ratio && width > 1) {
+#endif 
         width = switch_ratio;
       }
       width = round_up(n, width, GEMM_PREFERED_SIZE);