Fixed misplaced goto in http.c

Fixed misplaced goto in http.c

- In http.c:fio_http_queue function, when the user specifies rw=write
  and if curl_easy_perform fails then the control reaches line 565 and
  incorrectly prints: "WARNING: Only DDIR_READ/DDIR_WRITE/DDIR_TRIM are
supported!".
  Fix to this consists in moving statement: "goto err" at the end of the
  block as already has been done for trim/read blocks.

Signed-off-by: Giuseppe Baccini <giuseppe.baccini@suse.com>