src: Fix genl command payload size calculations.

[ossama-othman]

Correct generic netlink command payload buffer size calculations by aligning against the size of the attribute (e.g. sizeof(uint16_t)) as expected instead of size of the attribute size (e.g. sizeof(sizeof(uint16_t))).

Payload buffer sizes should now be smaller in some cases since netlink attributes are aligned on a 4 byte boundary. For example, the underlying NLA_ALIGN() macro returns 4 when the type is uint16_t, i.e. NLA_ALIGN(sizeof(uint16_t)). Previously, 8 was returned on 64 bit platforms since the NLA_ALIGN() call was incorrectly called as NLA_ALIGN(sizeof(sizeof(uint16_t))), which boils downs to NLA_ALIGN(size_t).

[coveralls]

Pull Request Test Coverage Report for Build 3390929654

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 51 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.03%) to 65.005%

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Files with Coverage Reduction	New Missed Lines	%
src/netlink_pm_upstream.c	51	73.16%
<!--	Total:	51		-->

Totals
Change from base Build 3086411145:	0.03%
Covered Lines:	1395
Relevant Lines:	2146

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💛 - Coveralls