Revert "Revert "Handle case where start_idx >= sizeof(unsieve_pattern_t)""
Revert "Revert "Handle case where start_idx >= sizeof(unsieve_pattern_t)""

This reverts commit 76caacb985577e643198fb7aa9e91042d1066fc5.

mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs