ice: Fix error return code in ice_add_prof()

Fix to return a error code from the error handling case
instead of 0, as done elsewhere in this function.

Fixes: 31ad4e4e ("ice: Allocate flow profile")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>