starpufft: return -1 on error instead of 1

starpufft/examples/testx.c

@@ -223,7 +223,7 @@ int main(int argc, char *argv[])
 #endif
 
 	ret = STARPUFFT(execute)(plan, in, out);
-	if (ret == 1) return 77;
+	if (ret == -1) return 77;
 	STARPUFFT(showstats)(stdout);
 
 #ifdef STARPU_HAVE_FFTW
@@ -238,7 +238,7 @@ int main(int argc, char *argv[])
 	starpu_vector_data_register(&out_handle, 0, (uintptr_t) out, size, sizeof(*out));
 
 	ret = STARPUFFT(execute_handle)(plan, in_handle, out_handle);
-	if (ret == 1) return 77;
+	if (ret == -1) return 77;
 
 	starpu_data_unregister(in_handle);
 	starpu_data_unregister(out_handle);

starpufft/starpufftx.c

@@ -289,7 +289,7 @@ STARPUFFT(execute)(STARPUFFT(plan) plan, void *in, void *out)
 	STARPUFFT(cleanup)(plan);
 
 	gettimeofday(&end, NULL);
-	return (task == NULL ? 1 : 0);
+	return (task == NULL ? -1 : 0);
 }
 
 int
@@ -298,7 +298,7 @@ STARPUFFT(execute_handle)(STARPUFFT(plan) plan, starpu_data_handle_t in, starpu_
 	int ret;
 
 	struct starpu_task *task = STARPUFFT(start_handle)(plan, in, out);
-	if (!task) return 1;
+	if (!task) return -1;
 	ret = starpu_task_wait(task);
 	STARPU_ASSERT(ret == 0);
 	return 0;