rcu: Remove linux/mutex.h from srcu.h

The include/linux/srcu.h file does not actually need anything from
include/linux/mutex.h that it doesn't get from elsewhere, so this commit
removes the inclusion.

Reported-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
1 file changed