tests/microbenchs: make sure memory is always initialized

tests/microbenchs/parallel_redux_heterogeneous_tasks_data.c

@@ -148,7 +148,7 @@ int main(int argc, char *argv[])
 	float *vector;
 	starpu_data_handle_t vector_handle;
 	unsigned i,j;
-	vector = malloc(NB_FLOAT * sizeof(float));
+	vector = calloc(NB_FLOAT, sizeof(float));
 #ifndef STARPU_SIMGRID
 	for (i = 0; i < NB_FLOAT; i++)
 		vector[i] = (i+1.0f);

tests/microbenchs/parallel_redux_homogeneous_tasks_data.c

@@ -118,7 +118,7 @@ int main(int argc, char *argv[])
 	float *vector;
 	starpu_data_handle_t vector_handle;
 	unsigned i,j;
-	vector = malloc(NB_FLOAT * sizeof(float));
+	vector = calloc(NB_FLOAT, sizeof(float));
 #ifndef STARPU_SIMGRID
 	for (i = 0; i < NB_FLOAT; i++)
 		vector[i] = (i+1.0f);