Added missing lock() unlock() to MuORB

The commented out lock and unlock were determined to be needed and added back.

The unit test for VDev was updated. It showed the race between the poll and a
write that only does a poll_notify().

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

src/modules/uORB/MuORB.cpp

@@ -310,8 +310,7 @@ ORBDevNode::read(device::file_t *filp, char *buffer, size_t buflen)
 	/*
 	 * Perform an atomic copy & state update
 	 */
-	// FIXME - This used to disable interrupts
-	//lock();
+	lock();
 
 	/* if the caller doesn't want the data, don't give it to them */
 	if (nullptr != buffer)
@@ -329,7 +328,7 @@ ORBDevNode::read(device::file_t *filp, char *buffer, size_t buflen)
 	 */
 	sd->update_reported = false;
 
-	//unlock();
+	unlock();
 
 	return _meta->o_size;
 }
@@ -366,7 +365,6 @@ ORBDevNode::write(device::file_t *filp, const char *buffer, size_t buflen)
 		return -EIO;
 
 	/* Perform an atomic copy. */
-	// FIXME - make sure lock is what we want here
 	lock();
 	memcpy(_data, buffer, _meta->o_size);
 	unlock();