locking: Use bit shift for flag values not constant values.

So far it hasn't bitten us, but if the next value wasn't 4, then
the logic used to check flag bits would have issues.

src/locking/lock_driver_lockd.h

@@ -23,8 +23,8 @@
 # define __VIR_LOCK_DRIVER_LOCKD_H__
 
 enum virLockSpaceProtocolAcquireResourceFlags {
-        VIR_LOCK_SPACE_PROTOCOL_ACQUIRE_RESOURCE_SHARED = 1,
-        VIR_LOCK_SPACE_PROTOCOL_ACQUIRE_RESOURCE_AUTOCREATE = 2,
+        VIR_LOCK_SPACE_PROTOCOL_ACQUIRE_RESOURCE_SHARED = (1 << 0),
+        VIR_LOCK_SPACE_PROTOCOL_ACQUIRE_RESOURCE_AUTOCREATE = (1 << 1),
 };
 
 #endif /* __VIR_LOCK_DRIVER_LOCKD_H__ */