Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/include/linux/ipmi.h b/include/linux/ipmi.h
index 41f5c08..ef61676 100644
--- a/include/linux/ipmi.h
+++ b/include/linux/ipmi.h
@@ -27,7 +27,7 @@
  * Opaque type for a IPMI message user.  One of these is needed to
  * send and receive messages.
  */
-typedef struct ipmi_user *ipmi_user_t;
+struct ipmi_user;
 
 /*
  * Stuff coming from the receive interface comes as one of these.