octeontx2-pf: Fix otx2_get_fecparam()

Static checkers complained about an off by one read overflow in
otx2_get_fecparam() and we applied two conflicting fixes for it.

Correct: b0aae0bd ("octeontx2: Fix condition.")
  Wrong: 93efb0c6 ("octeontx2-pf: Fix out-of-bounds read in otx2_get_fecparam()")

Revert the incorrect fix.

Fixes: 93efb0c6 ("octeontx2-pf: Fix out-of-bounds read in otx2_get_fecparam()")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>