init shmem early to avoid random crash in fastrpc (#6407)

* init shmem early to avoid possible crash

* fix_code_style

* Keep the initialziation to NULL, remove the duplicate memory allocation

src/modules/uORB/uORBDevices.cpp

@@ -449,7 +449,6 @@ uORB::DeviceNode::publish(const orb_metadata *meta, orb_advert_t handle, const v
 		return ERROR;
 	}
 
-#if !defined(__PX4_QURT_EXCELSIOR) && !defined(__PX4_POSIX_EXCELSIOR)
 	/*
 	 * if the write is successful, send the data over the Multi-ORB link
 	 */
@@ -463,7 +462,6 @@ uORB::DeviceNode::publish(const orb_metadata *meta, orb_advert_t handle, const v
 		}
 	}
 
-#endif
 	return PX4_OK;
 }