LU-5577 ldlm: count of pools is unsigned long

LU-5577 ldlm: count of pools is unsigned long

Function ldlm_pools_count() return unsigned long but counter is int.
Use ldlm_pool_granted() everywhere.

Signed-off-by: Dmitry Eremin <dmitry.eremin@intel.com>
Change-Id: I6ee7bb1ba7f9590a776465b00e63584aada5f7dc
Reviewed-on: http://review.whamcloud.com/12304
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>