Avoid rendering errors caused by linejoins on tiny distances.

If we perform a linejoin that ends up being over an impossibly small
distance, we can get a rendering error. This is caused by trying to
calculate scale = linewidth/sqrtf(len), where len < FLT_EPSILON.

Avoid this by rearranging the code slightly - no extra calculations
required.

Also given that sn == bn at all times within the stroking code, just
remove bn.

Credit for spotting this problem goes to Simon for tracking the
problem with rounding_artifact_due_to_closepath.pdf. My fix just
fixes the problem at a lower level than his does.

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