Use correct type in dof_map_constraints.C
Use correct type in dof_map_constraints.C

This mixup would never have turned into a bug but it definitely makes
the code look misleading.

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