fsx: disable allocsp_calls if -F is specified

fsx: disable allocsp_calls if -F is specified

As the fsx.c source code says:
  int     fallocate_calls = 1;            /* -F flag disables */
  int     allocsp_calls = 1;              /* -F flag disables */

The allocsp_calls and fallocate_calls should be disabled, if the -F
option is specified. But current fsx forgets to disable allocsp_calls
as is documented.

Signed-off-by: Zorro Lang <zlang@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>