comment fix

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@3035 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

src/winio.c

@@ -4144,7 +4144,7 @@ int check_linenumbers(const filestruct *fileptr)
 
     return check_line;
 }
-#endif
+#endif /* !NDEBUG */
 
 #ifdef DEBUG
 /* Dump the filestruct inptr to stderr. */