Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/include/rdma/ib_fmr_pool.h b/include/rdma/ib_fmr_pool.h
index f62b842..f8982e4 100644
--- a/include/rdma/ib_fmr_pool.h
+++ b/include/rdma/ib_fmr_pool.h
@@ -88,6 +88,6 @@
 					 int                 list_len,
 					 u64                 io_virtual_address);
 
-int ib_fmr_pool_unmap(struct ib_pool_fmr *fmr);
+void ib_fmr_pool_unmap(struct ib_pool_fmr *fmr);
 
 #endif /* IB_FMR_POOL_H */