Resolve cppcheck issues.

Signed-off-by: John Hood <cgull@glup.org>

src/statesync/completeterminal.h

@@ -70,7 +70,7 @@ namespace Terminal {
     int wait_time( uint64_t now ) const;
 
     /* interface for Network::Transport */
-    void subtract( const Complete * ) {}
+    void subtract( const Complete * ) const {}
     std::string diff_from( const Complete &existing ) const;
     void apply_string( std::string diff );
     bool operator==( const Complete &x ) const;

src/statesync/user.cc

@@ -123,7 +123,7 @@ void UserStream::apply_string( string diff )
   }
 }
 
-const Parser::Action *UserStream::get_action( unsigned int i )
+const Parser::Action *UserStream::get_action( unsigned int i ) const
 {
   switch( actions[ i ].type ) {
   case UserByteType:

src/statesync/user.h

@@ -84,7 +84,7 @@ namespace Network {
     
     bool empty( void ) const { return actions.empty(); }
     size_t size( void ) const { return actions.size(); }
-    const Parser::Action *get_action( unsigned int i );
+    const Parser::Action *get_action( unsigned int i ) const;
     
     /* interface for Network::Transport */
     void subtract( const UserStream *prefix );
@@ -92,7 +92,7 @@ namespace Network {
     void apply_string( string diff );
     bool operator==( const UserStream &x ) const { return actions == x.actions; }
 
-    bool compare( const UserStream & ) const { return false; }
+    bool compare( const UserStream & ) { return false; }
   };
 }