Various cleanup in incard():

Various cleanup in incard():
* get_line() always returns the same non-NULL pointer,
so testing the return value is useless.
* Garbage collect the unused variable *line.
* Check for end-of-buffer before parsing the next word instead of after it.
* Skip strlen() when the length has been measured three lines before anyway.
* Do not initialize local variables over and over again.
feedback and ok pjanzen@