Use std::move in two more places (#275)

As suggested by Coverity Scan

Signed-off-by: Sebastian Pipping <[email protected]>

Author: hartwork

src/libfuzzer/libfuzzer_macro.cc

@@ -235,7 +235,7 @@ void RegisterPostProcessor(
     const protobuf::Descriptor* desc,
     std::function<void(protobuf::Message* message, unsigned int seed)>
         callback) {
-  GetMutator()->RegisterPostProcessor(desc, callback);
+  GetMutator()->RegisterPostProcessor(desc, std::move(callback));
 }
 
 }  // namespace libfuzzer

src/mutator.cc

@@ -502,7 +502,7 @@ class PostProcessing {
           Run(It->second.get(), max_depth);
           std::string value;
           It->second->SerializePartialToString(&value);
-          *any->mutable_value() = value;
+          *any->mutable_value() = std::move(value);
         }
       }
     }