examples: check the value returned by libusb_handle_events()

Problem detected by the Coverity tool
CID 1042539 (#1 of 1): Unchecked return value (CHECKED_RETURN)8.
check_return: Calling function "libusb_handle_events(libusb_context *)"
without checking return value (as is done elsewhere 6 out of 7 times).

1 files changed, 3 insertions, 1 deletions

diff --git a/examples/hotplugtest.c b/examples/hotplugtest.c
index 6cdf0c8..368011b 100644
--- a/examples/hotplugtest.c
+++ b/examples/hotplugtest.c
@@ -95,7 +95,9 @@ int main(int argc, char *argv[])
 	}
 
 	while (done < 2) {
-		libusb_handle_events (NULL);
+		rc = libusb_handle_events (NULL);
+		if (rc < 0)
+			printf("libusb_handle_events() failed: %s\n", libusb_error_name(rc));
 	}
 
 	libusb_exit (NULL);