Chomp file ends

Removed empty lines from end of src/*.[ch] files.
If the new last line became '#endif'
was the condition of the '#if' added.

src/dhcp6.c

@@ -825,6 +825,4 @@ void dhcp_construct_contexts(time_t now)
     }
 }
 
-#endif
-
-
+#endif /* HAVE_DHCP6 */