systemctl: remove empty line between comment and action

It's harder to miss the comment without the newline ;)
See https://github.com/systemd/systemd/pull/3336#issuecomment-221749423
for context.

src/systemctl/systemctl.c

@@ -7841,6 +7841,5 @@ finish:
         release_busses();
 
         /* Note that we return r here, not EXIT_SUCCESS, so that we can implement the LSB-like return codes */
-
         return r < 0 ? EXIT_FAILURE : r;
 }