Isaac Huang 0336f3d001 Remove useless variable spa_active_count
This isn't required for the Linux port because the kernel tracks
if a module is busy.  The prototype for spa_busy() is also removed
since its definition was already removed.

Signed-off-by: Isaac Huang <he.huang@intel.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #3262
2015-04-27 09:22:05 -07:00
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