tests/exynos: replace return by break

The 'usage' function already does exit(0), so that this
'return -EINVAL' is never called. Just put a break there
to avoid confusion.

Signed-off-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
Acked-by: Emil Velikov <emil.l.velikov@gmail.com>

tests/exynos/exynos_fimg2d_test.c

@@ -689,7 +689,7 @@ int main(int argc, char **argv)
 			break;
 		default:
 			usage(argv[0]);
-			return -EINVAL;
+			break;
 		}
 	}