b43: remove SHM spinlock
This removes the SHM spinlock. SHM is protected by wl->mutex. Signed-off-by: NMichael Buesch <mb@bu3sch.de> Tested-by: NLarry Finger <Larry.Finger@lwfinger.net> Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
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