Patch for memory leak

[dan.weber]

This is a patch for a small memory leak I noticed while writing a program using 
terminfo. setupterm() allocates memory to the global variable home_terminfo (in 
the function _nc_home_terminfo()). This is not freed by del_curterm() as it 
should be. The code added to del_curterm() simply checks if home_terminfo is 
NULL and, if not, frees it. Let me know if you need anything else.

Dan Weber

lib_cur_term.patch
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