e1000: clean up the checking logic

The checking logic needed some clean-up work, so we rewrite it by
checking for break first. With that change in place, we can even move
the second check for goto statement outside of the loop.

As this is merely a cleanup, no functional change is involved. The
questionable 'tmp != 0xFF' is intentionally left alone.

Mark Rustad and Alexander Duyck contributed to this patch.

CC: Mark Rustad <[email protected]>
CC: Alex Duyck <[email protected]>
Signed-off-by: Jean Sacren <[email protected]>
Tested-by: Aaron Brown <[email protected]>
Signed-off-by: Jeff Kirsher <[email protected]>

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