add missing comment

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@2986 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

src/search.c

@@ -1324,5 +1324,5 @@ char *get_history_completion(filestruct **h, const char *s, size_t len)
      * match, or len is 0.  Return s. */
     return (char *)s;
 }
-#endif
+#endif /* !DISABLE_TABCOMP */
 #endif /* !NANO_SMALL */