Call LLVMDisposeMessage only if there was an error.
Call LLVMDisposeMessage only if there was an error.

go-llvm/llvm,axw/go-llvm-testing,axw/go-llvm-testing,go-llvm/llvm,go-llvm/llvm,go-llvm/llvm,nsf/gollvm,axw/go-llvm-testing,axw/go-llvm-testing