Ensure iterations is non-negative before uint32_t cast
Ensure iterations is non-negative before uint32_t cast

This is just a sanity check before casting to an unsigned integer. In practice, the iteration count should be much higher.

remicollet/mongo-c-driver,rcsanchez97/mongo-c-driver,mongodb/mongo-c-driver,derickr/mongo-c-driver,jmikola/mongo-c-driver,rcsanchez97/mongo-c-driver,remicollet/mongo-c-driver,mongodb/mongo-c-driver,ajdavis/mongo-c-driver,mongodb/mongo-c-driver,jmikola/mongo-c-driver,ajdavis/mongo-c-driver,derickr/mongo-c-driver,beingmeta/mongo-c-driver,derickr/mongo-c-driver,jmikola/mongo-c-driver,jmikola/mongo-c-driver,beingmeta/mongo-c-driver,acmorrow/mongo-c-driver,beingmeta/mongo-c-driver,ajdavis/mongo-c-driver,acmorrow/mongo-c-driver,ajdavis/mongo-c-driver,remicollet/mongo-c-driver,rcsanchez97/mongo-c-driver,derickr/mongo-c-driver,rcsanchez97/mongo-c-driver,acmorrow/mongo-c-driver,beingmeta/mongo-c-driver,jmikola/mongo-c-driver,beingmeta/mongo-c-driver,acmorrow/mongo-c-driver,acmorrow/mongo-c-driver,ajdavis/mongo-c-driver,derickr/mongo-c-driver,mongodb/mongo-c-driver,derickr/mongo-c-driver,rcsanchez97/mongo-c-driver,mongodb/mongo-c-driver,acmorrow/mongo-c-driver,ajdavis/mongo-c-driver,mongodb/mongo-c-driver,ajdavis/mongo-c-driver,remicollet/mongo-c-driver,remicollet/mongo-c-driver,beingmeta/mongo-c-driver,rcsanchez97/mongo-c-driver,beingmeta/mongo-c-driver,rcsanchez97/mongo-c-driver,beingmeta/mongo-c-driver,remicollet/mongo-c-driver,derickr/mongo-c-driver,remicollet/mongo-c-driver,jmikola/mongo-c-driver,mongodb/mongo-c-driver,acmorrow/mongo-c-driver,jmikola/mongo-c-driver