LU-4629 libcfs: fix issues found by Klocwork Insight tool

LU-4629 libcfs: fix issues found by Klocwork Insight tool

sscanf format specification '%u' expects type 'unsigned int *'
for 'u', but parameter 3 has a different type 'int*'.

Pointer 'cfs_crypto_hash_type(d->hd_hash->ha_id)' returned from
call to function 'cfs_crypto_hash_type' at line 261 may be NULL
and will be dereferenced at line 261.

Signed-off-by: Dmitry Eremin <dmitry.eremin@intel.com>
Change-Id: I9945a7e5d44329aa6417946106212cb269395290
Reviewed-on: http://review.whamcloud.com/9400
Tested-by: Jenkins
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>