iommufd/selftest: Update the fail_nth limit

There are more failure conditions now so 400 iterations is not enough pass
them all, up it to 1000. The limit exists so it doesn't infinite loop.

Link: https://patch.msgid.link/r/[email protected]
Reviewed-by: Nicolin Chen <[email protected]>
Reviewed-by: Kevin Tian <[email protected]>
Tested-by: Nicolin Chen <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>

Author: jgunthorpe

tools/testing/selftests/iommu/iommufd_fail_nth.c

@@ -113,7 +113,7 @@ static bool fail_nth_next(struct __test_metadata *_metadata,
 	 * necessarily mean a test failure, just that the limit has to be made
 	 * bigger.
 	 */
-	ASSERT_GT(400, nth_state->iteration);
+	ASSERT_GT(1000, nth_state->iteration);
 	if (nth_state->iteration != 0) {
 		ssize_t res;
 		ssize_t res2;