LU-15048 quota: check that qti_lqes has been inited

LU-15048 quota: check that qti_lqes has been inited

qti_lqes_resotre_{init,fini}() should check that qti_lqes
has been inited before address qti_lqes_count.

Fix helps against following panic:
    qti_lqes_restore_fini() ASSERTION(qmt_info(env)->qti_lqes_rstr)

Lustre-change: https://review.whamcloud.com/45102
Lustre-commit: d2e8208e22f21bb7354a9207f381217c222d3df3

HPE-bug-id: LUS-10239
Change-Id: Ic93d87535f615fe419b2c3a2453506c515837031
Reviewed-by: Alexander Boyko <alexander.boyko@hpe.com>
Reviewed-by: Shaun Tancheff <stancheff@cray.com>
Tested-by: Elena Gryaznova <c17455@cray.com>
Signed-off-by: Sergey Cheremencev <sergey.cheremencev@hpe.com>
Reviewed-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Reviewed-on: https://review.whamcloud.com/46788
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Hongchao Zhang <hongchao@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>