fix small bug introduced by #1660

If `ti->semanticTiargs(sc)` returns false, CallExp should return ErrorExp.
fix Issue 10634 - Win64: wrong codegen with .int of small structs
Merge pull request #2353 from 9rnsr/fix_bug

[critical] fix small bug introduced by #1660
Merge pull request #2354 from WalterBright/fix10634

fix Issue 10634 - Win64: wrong codegen with .int of small structs