Use integer arithmetic for work size calculation
Use integer arithmetic for work size calculation

This fixes a conversion warning and might be faster.

pbauman/libmesh,capitalaslash/libmesh,BalticPinguin/libmesh,giorgiobornia/libmesh,90jrong/libmesh,jwpeterson/libmesh,capitalaslash/libmesh,roystgnr/libmesh,pbauman/libmesh,BalticPinguin/libmesh,dschwen/libmesh,pbauman/libmesh,pbauman/libmesh,pbauman/libmesh,pbauman/libmesh,90jrong/libmesh,giorgiobornia/libmesh,roystgnr/libmesh,libMesh/libmesh,hrittich/libmesh,roystgnr/libmesh,capitalaslash/libmesh,hrittich/libmesh,libMesh/libmesh,hrittich/libmesh,90jrong/libmesh,capitalaslash/libmesh,jwpeterson/libmesh,dschwen/libmesh,giorgiobornia/libmesh,dschwen/libmesh,capitalaslash/libmesh,capitalaslash/libmesh,libMesh/libmesh,hrittich/libmesh,pbauman/libmesh,giorgiobornia/libmesh,capitalaslash/libmesh,BalticPinguin/libmesh,giorgiobornia/libmesh,dschwen/libmesh,90jrong/libmesh,90jrong/libmesh,BalticPinguin/libmesh,libMesh/libmesh,roystgnr/libmesh,90jrong/libmesh,BalticPinguin/libmesh,roystgnr/libmesh,libMesh/libmesh,pbauman/libmesh,BalticPinguin/libmesh,giorgiobornia/libmesh,capitalaslash/libmesh,roystgnr/libmesh,giorgiobornia/libmesh,giorgiobornia/libmesh,jwpeterson/libmesh,hrittich/libmesh,hrittich/libmesh,jwpeterson/libmesh,hrittich/libmesh,jwpeterson/libmesh,libMesh/libmesh,jwpeterson/libmesh,jwpeterson/libmesh,BalticPinguin/libmesh,roystgnr/libmesh,roystgnr/libmesh,BalticPinguin/libmesh,dschwen/libmesh,dschwen/libmesh,pbauman/libmesh,90jrong/libmesh,jwpeterson/libmesh,giorgiobornia/libmesh,dschwen/libmesh,hrittich/libmesh,hrittich/libmesh,90jrong/libmesh,libMesh/libmesh,libMesh/libmesh,dschwen/libmesh,90jrong/libmesh