fabrics: Do not return in the middle of the subcommand

fabrics: Do not return in the middle of the subcommand

This patch also makes fabrics module to not return the internal error
status in the middle of the subcommands to support uniformed mapped
error value which will be introduced in the next patches.

Cc: Keith Busch <kbusch@kernel.org>
Cc: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Cc: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Minwoo Im <minwoo.im.dev@gmail.com>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>