evdev: Avoid unintended case drop through

e->code is in the same range for ABS_ and for REL_. As the code currently
stands and for the current values in Linux's input.h there is no risk of a
problem. However just in case it would be wise to break after evaluating the
relative events.

Signed-off-by: Rob Bradford <rob@linux.intel.com>

src/evdev.c

@@ -195,6 +195,7 @@ is_motion_event(struct input_event *e)
 		case REL_Y:
 			return 1;
 		}
+		break;
 	case EV_ABS:
 		switch (e->code) {
 		case ABS_X: