cli: use static_cast in execution of Dot

alib2cli/src/builtin/Dot.cpp

@@ -41,7 +41,7 @@ void Dot::run ( const std::string & data, const std::string & outputType, const
 			throw exception::CommonException ( "Dot: Failed to spawn child process." );
 	} else {
 		close ( fd [ 0 ] );
-		if ( write ( fd [ 1 ], data.c_str ( ), data.size ( ) + 1 ) != ( ssize_t ) data.size ( ) + 1 )
+		if ( write ( fd [ 1 ], data.c_str ( ), data.size ( ) + 1 ) != static_cast < ssize_t > ( data.size ( ) ) + 1 )
 			throw exception::CommonException ( "Dot: Failed to write data to dot child process." );
 		close ( fd [ 1 ] );