kernel: Return after panic when freeing invalid interrupt range.

The panic is continuable, but moving on with the free will overrun the
array and corrupt memory.

Change-Id: I9a5849a40158042150a25740ca57d711aee872bf
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3114
Reviewed-by: waddlesplash <[email protected]>

src/system/kernel/int.cpp

@@ -696,6 +696,7 @@ free_io_interrupt_vectors(long count, long startVector)
 	if (startVector + count > NUM_IO_VECTORS) {
 		panic("invalid start vector %ld or count %ld supplied to "
 			"free_io_interrupt_vectors\n", startVector, count);
+		return;
 	}
 
 	dprintf("free_io_interrupt_vectors: freeing %ld vectors starting "