igb: fix array size calculation
igb: fix array size calculation

Use ARRAY_SIZE for array size calculation.

Signed-off-by: Todd Fujinaka <466a62000b5b4767fc2c795fe80d3a0328f10ed6@intel.com>
Tested-by: Aaron Brown <4723df1d9a4136f7b76e1bf6434e33afc91d2139@intel.com>
Signed-off-by: Jeff Kirsher <87e35f5be20bb3e67f4ba6b86f5f6be3085b1b3a@intel.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs