arvtest: fix maybe unitialized warning

Author: EmmanuelP

src/arvtest.c

@@ -322,7 +322,7 @@ arv_test_device_properties (ArvTest *test, ArvTestCamera *test_camera)
 {
         g_autoptr (GError) error = NULL;
         g_autofree gint *sensor_size = NULL;
-        g_autofree char *comment;
+        g_autofree char *comment = NULL;
         ArvTestStatus status;
         gint sensor_width, sensor_height;
         gsize size = 0;
@@ -336,8 +336,6 @@ arv_test_device_properties (ArvTest *test, ArvTestCamera *test_camera)
                                     error == NULL ? ARV_TEST_STATUS_SUCCESS : ARV_TEST_STATUS_FAILURE,
                                     error != NULL ? error->message : NULL);
 
-        comment = NULL;
-
         if (error == NULL && size == 2) {
                 if (sensor_size[0] != sensor_width ||
                     sensor_size[1] != sensor_height) {