ptp: ptp_clockmatrix: Coding style - tighten vertical spacing.

Code clean-up.

* Remove blank line between variable declarations.
* Remove blank line between:
	err = blah(...)

	if (err)
		...
* Remove unnecessary blank line before/after loop constructs.
Signed-off-by: Vincent Cheng <vincent.cheng.xh@renesas.com>
Signed-off-by: David S. Miller <davem@davemloft.net>