fnic: return zero on fnic_reset() success

fnic: return zero on fnic_reset() success

When issue LIP by sysfs found write("1") returned 8194, this caused by
fnic_reset() return SUCCESS to store_fc_private_host_issue_lip(). Return 0/-1
for fnic_reset() fix this issue.

Tested-by: Sriharsha <sriharsha.devdas@oracle.com>
Signed-off-by: Joe Jin <joe.jin@oracle.com>
Cc: Abhijeet Joglekar <abjoglek@cisco.com>
Cc: Venkata Siva Vijayendra Bhamidipati <vbhamidi@cisco.com>
Cc: Brian Uchino <buchino@cisco.com>
CC: stable@vger.kernel.org