srcu: Fix long lines in srcu_funnel_gp_start()

This commit creates an srcu_usage pointer named "sup" as a shorter
synonym for the "ssp->srcu_sup" that was bloating several lines of code.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
1 file changed