The single-allocation buddy wrapper functions did not serve much of a
purpose but waiting for FP_OPEN, which has now been moved to
fellow_dskbuddy().

Fixes #48

... a chance to take memory from the old

otherwise we would hold onto log blocks for a long time, possibly until
the next ref'ing flush. This could cause lock ups due to no memory being
available.

This is considered a major contribution towards fixing the lockup issues
documented in #41

kick the logwatcher first before potentially running into a synchronous
flush.