[Click] click-fastclassifier segfault

[springbo at cs.wisc.edu]

Hello,

click-fastclassifier was segfaulting on my machines. Further investigation
revealed add_line_directive in RouterT::unparse_declarations() was causing
the problem.

click-fastclassifier adds 'Idle' elements when creating the
classifiers_program. These 'Idle' elements do not have landmarks set.
add_line_directive segfaults when called on an element without a landmark.

The attached patch fixes click-fastclassifier's segfault by explicitly
setting a landmark for the 'Idle' elements.


~Kevin Springborn
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