teamd: fix coverity error in teamd_sriov_physfn_addr

Passing variable "256UL" as argument 3 to function readlink, which returns
that argument. The value of "ret" is now 256.
Overrunning array "link" of 256 bytes at byte offset 256 using index
"ret" (which evaluates to 256).

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
teamd: teamd_state_val_dump move TEAMD_BUG_ON so it can be actually triggered

Signed-off-by: Jiri Pirko <jiri@resnulli.us>