tests : fix UB in test-quantize-perf

Author: ggerganov

tests/test-quantize-perf.cpp

@@ -76,7 +76,7 @@ static void * align_with_offset(void * ptr, int offset) {
     return (char *) std::align(MAX_ALIGNMENT, MAX_ALIGNMENT, ptr, dummy_size) + offset;
 }
 
-static void benchmark_function(size_t size, size_t q_size, int64_t iterations, const std::function<size_t(void)> & function) {
+static void benchmark_function(size_t size, size_t q_size, int64_t iterations, const std::function<float(void)> & function) {
     int64_t min_time_us = INT64_MAX;
     int64_t total_time_us = 0;
     int64_t min_time_cycles = INT64_MAX;
@@ -283,7 +283,7 @@ int main(int argc, char * argv[]) {
                 printf("  quantize_row_q_reference\n");
                 for (size_t size : params.test_sizes) {
                     printf("    %zu values (%.2f MB)\n", size, 4*size/(float)(1024*1024));
-                    auto quantize_fn = [&](void ) {
+                    auto quantize_fn = [&](void) -> float {
                         qfns.from_float_reference(test_data1, test_q1, size);
                         return test_q1[0];
                     };