bench : minor fixes

extra/bench-all.sh

@@ -19,7 +19,7 @@ printf "\n"
 ./bench -w 1 -t 1 2>&1
 
 printf "\n"
-printf "Running ggml_mul_mat benchmark with " $n_threads " threads\n"
+printf "Running ggml_mul_mat benchmark with $n_threads threads\n"
 printf "\n"
 
 ./bench -w 2 -t $n_threads 2>&1

whisper.cpp

@@ -4103,7 +4103,7 @@ WHISPER_API int whisper_bench_memcpy(int n_threads) {
 
         for (size_t i = 0; i < size; i++) sum += dst[i];
 
-        fprintf(stderr, "sum:    %s\n", sum == -536870910.00 ? "ok" : "error");
+        fprintf(stderr, "sum:    %s %f\n", sum == -536870910.00 ? "ok" : "error", sum);
     }
 
     free(src);