Remove unnecessary () values.

lib/frontend/src/ssa.rs

@@ -72,7 +72,6 @@ impl<Variable> BlockData<Variable> {
             &mut BlockData::EbbBody { .. } => panic!("you can't add a predecessor to a body block"),
             &mut BlockData::EbbHeader(ref mut data) => {
                 data.predecessors.insert(pred, inst);
-                ()
             }
         }
     }

lib/wasm/src/sections_translator.rs

@@ -139,7 +139,6 @@ pub fn parse_export_section(parser: &mut Parser)
                     &ExternalKind::Function => {
                         exports.insert(index as FunctionIndex,
                                        String::from(from_utf8(field).unwrap()));
-                        ()
                     }
                     _ => (),//TODO: deal with other kind of exports
                 }