tools:iio:iio_event_monitor: check if event is fully read

Check that the read event is of the expected size.
Signed-off-by: Hartmut Knaack <knaack.h@gmx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

tools/iio/iio_event_monitor.c

@@ -310,6 +310,12 @@ int main(int argc, char **argv)
 			}
 		}
 
+		if (ret != sizeof(event)) {
+			printf("Reading event failed!\n");
+			ret = -EIO;
+			break;
+		}
+
 		print_event(&event);
 	}