igb: use ARRAY_SIZE to replace calculating sizeof(a)/sizeof(a[0])
igb: use ARRAY_SIZE to replace calculating sizeof(a)/sizeof(a[0])

Use the ARRAY_SIZE macro rather than calculating sizeof(a)/sizeof(a[0]).
Also directly replace the code rather than using an unnecessary define.

Reported-by: Maninder Singh <e4d6a675ffd00e654bdb5954d1e8457eb138a1df@samsung.com>
Reported-by: Joe Perches <16a9a54ddf4259952e3c118c763138e83693d7fd@perches.com>
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