Fix `GP_UNKNOWN_EVENT` leaks in examples (#833)

Most of the examples give wrong impression that `GP_UNKNOWN_EVENT` data does not need to be freed / is not heap allocated, however it's not the case - those messages are always `malloc`'d by corresponding drivers.

1 files changed, 2 insertions, 0 deletions

diff --git a/examples/best-iso.c b/examples/best-iso.c
index 477e272d6..a023347c3 100644
--- a/examples/best-iso.c
+++ b/examples/best-iso.c
@@ -302,6 +302,8 @@ camera_tether(Camera *camera, GPContext *context) {
 						free (val);
 					}
 				}
+				
+				free(evtdata);
 			} else {
 				printf("Unknown event.\n");
 			}