regcache: Make sure we sync register 0 in an rbtree cache
authorMark Brown <broonie@opensource.wolfsonmicro.com>
Mon, 5 Mar 2012 23:31:39 +0000 (23:31 +0000)
committerMark Brown <broonie@opensource.wolfsonmicro.com>
Mon, 5 Mar 2012 23:48:50 +0000 (23:48 +0000)
Most of the current users have register 0 as a volatile register or don't
have a register 0 so it's not been apparent that it's not getting synced.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

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