Redundant if flagged by hlint

[gustavo-grieco]

-- src/EVM.hs:(2490,7)-(2498,65): Warning: Redundant if
-- Found:
  if offs64 + sz64 < sz64 then
      vmError IllegalOverflow
  else
      if offs64 >= 0x0fffffff || sz64 >= 0x0fffffff then
          vmError IllegalOverflow
      else
          accessUnboundedMemoryRange offs64 sz64 continue
-- Perhaps:
  (if (offs64 + sz64 < sz64)
        || (offs64 >= 0x0fffffff || sz64 >= 0x0fffffff) then
       vmError IllegalOverflow
   else
       accessUnboundedMemoryRange offs64 sz64 continue)